build: pin GitHub Actions to commit SHAs at latest versions

Update all actions across CI, release, and auto-approve workflows
to be pinned to specific commit SHAs for supply chain security.

- hmarr/auto-approve-action: v2 → v4.0.0
- actions/checkout: v4 → v6.0.2
- actions/setup-node: v4 → v6.3.0
- actions/cache: v4 → v5.0.4
- peter-evans/create-pull-request: v5.0.3 → v8.1.0
- peter-evans/enable-pull-request-automerge: v3 → v3.0.0

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: milesarmstrong

.github/workflows/autoapprove.yml

@@ -6,7 +6,7 @@ jobs:
   auto-approve:
     runs-on: ubuntu-latest
     steps:
-      - uses: hmarr/auto-approve-action@v2
+      - uses: hmarr/auto-approve-action@f0939ea97e9205ef24d872e76833fa908a770363 # v4.0.0
         if: github.actor == 'duffel-bot'
         with:
           github-token: '${{ secrets.GITHUB_TOKEN }}'

.github/workflows/ci.yml

@@ -17,10 +17,10 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Check out repository
-        uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4
+        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
 
       - name: Set up Node.js
-        uses: actions/setup-node@49933ea5288caeca8642d1e84afbd3f7d6820020 # v4
+        uses: actions/setup-node@53b83947a5a98c8d113130e565377fae1a50d02f # v6.3.0
         with:
           node-version-file: .tool-versions
 
@@ -32,7 +32,7 @@ jobs:
         run: echo "dir=$(corepack yarn config get cacheFolder)" >> "$GITHUB_OUTPUT"
 
       - name: Cache Yarn packages
-        uses: actions/cache@v4
+        uses: actions/cache@668228422ae6a00e4ad889ee87cd7109ec5666a7 # v5.0.4
         with:
           path: ${{ steps.yarn-cache-dir-path.outputs.dir }}
           key: ${{ runner.os }}-yarn-${{ hashFiles('yarn.lock') }}
@@ -53,10 +53,10 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Check out repository
-        uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4
+        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
 
       - name: Set up Node.js
-        uses: actions/setup-node@49933ea5288caeca8642d1e84afbd3f7d6820020 # v4
+        uses: actions/setup-node@53b83947a5a98c8d113130e565377fae1a50d02f # v6.3.0
         with:
           node-version-file: .tool-versions
 
@@ -68,7 +68,7 @@ jobs:
         run: echo "dir=$(corepack yarn config get cacheFolder)" >> "$GITHUB_OUTPUT"
 
       - name: Cache Yarn packages
-        uses: actions/cache@v4
+        uses: actions/cache@668228422ae6a00e4ad889ee87cd7109ec5666a7 # v5.0.4
         with:
           path: ${{ steps.yarn-cache-dir-path.outputs.dir }}
           key: ${{ runner.os }}-yarn-${{ hashFiles('yarn.lock') }}
@@ -86,12 +86,12 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Check out repository
-        uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4
+        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
         with:
           fetch-depth: 0
 
       - name: Set up Node.js
-        uses: actions/setup-node@49933ea5288caeca8642d1e84afbd3f7d6820020 # v4
+        uses: actions/setup-node@53b83947a5a98c8d113130e565377fae1a50d02f # v6.3.0
         with:
           node-version-file: .tool-versions
 
@@ -103,7 +103,7 @@ jobs:
         run: echo "dir=$(corepack yarn config get cacheFolder)" >> "$GITHUB_OUTPUT"
 
       - name: Cache Yarn packages
-        uses: actions/cache@v4
+        uses: actions/cache@668228422ae6a00e4ad889ee87cd7109ec5666a7 # v5.0.4
         with:
           path: ${{ steps.yarn-cache-dir-path.outputs.dir }}
           key: ${{ runner.os }}-yarn-${{ hashFiles('yarn.lock') }}

.github/workflows/release.yml

@@ -8,12 +8,12 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
         with:
           fetch-depth: 0
 
       - name: Setup Node.js
-        uses: actions/setup-node@v4
+        uses: actions/setup-node@53b83947a5a98c8d113130e565377fae1a50d02f # v6.3.0
         with:
           node-version-file: .tool-versions
 
@@ -24,7 +24,7 @@ jobs:
         id: yarn-cache-dir-path
         run: echo "dir=$(corepack yarn config get cacheFolder)" >> "$GITHUB_OUTPUT"
 
-      - uses: actions/cache@v4
+      - uses: actions/cache@668228422ae6a00e4ad889ee87cd7109ec5666a7 # v5.0.4
         id: yarn-cache # use this to check for `cache-hit` (`steps.yarn-cache.outputs.cache-hit != 'true'`)
         with:
           path: ${{ steps.yarn-cache-dir-path.outputs.dir }}
@@ -66,7 +66,7 @@ jobs:
       - name: Create Pull Request with updated package files
         id: cpr
         if: steps.initversion.outputs.version != steps.extractver.outputs.extractver
-        uses: peter-evans/create-pull-request@v5.0.3
+        uses: peter-evans/create-pull-request@c0f553fe549906ede9cf27b5156039d195d2ece0 # v8.1.0
         with:
           token: ${{ secrets.PAT }}
           commit-message: 'ci(release): ${{ steps.extractver.outputs.extractver }}'
@@ -85,7 +85,7 @@ jobs:
 
       - name: Enable Pull Request Automerge
         if: steps.cpr.outputs.pull-request-operation == 'created'
-        uses: peter-evans/enable-pull-request-automerge@v3
+        uses: peter-evans/enable-pull-request-automerge@a660677d5469627102a1c1e11409dd063606628d # v3.0.0
         with:
           token: ${{ secrets.PAT }}
           pull-request-number: ${{ steps.cpr.outputs.pull-request-number }}