chore(deps): update actions/checkout action to v6

Author: renovate[bot]

.github/workflows/release.yml

@@ -6,7 +6,7 @@ jobs:
   publish:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v6
       - uses: actions/setup-node@v1
         with:
           registry-url: https://registry.npmjs.org

.github/workflows/release_dev.yml

@@ -7,7 +7,7 @@ jobs:
   publish:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v6
       - uses: actions/setup-node@v1
         with:
           registry-url: https://registry.npmjs.org

.github/workflows/spec.yml

@@ -11,7 +11,7 @@ jobs:
           - 16
           - 18
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v6
       - uses: actions/setup-node@v1
         with:
           node-version: ${{ matrix.node }}