Bump stack CI to latest versions

Author: andreasabel

.github/workflows/stack.yml

@@ -34,7 +34,7 @@ jobs:
         shell: bash
 
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
 
     - uses: haskell-actions/setup@v2
       id: setup
@@ -66,7 +66,7 @@ jobs:
         sudo apt-get install libbrotli-dev -qq
 
     - name: Cache dependencies (restore)
-      uses: actions/cache/restore@v4
+      uses: actions/cache/restore@v5
       id: cache
       with:
         path: ${{ steps.setup.outputs.stack-root }}
@@ -88,7 +88,7 @@ jobs:
         stack test ${{ env.ARGS }} --flag HsOpenSSL:use-pkg-config
 
     - name: Cache dependencies (save)
-      uses: actions/cache/save@v4
+      uses: actions/cache/save@v5
       if: always() && steps.cache.outputs.cache-hit != 'true'
       # # Will fail if we already have a cache with this key (in this case, cache-hit is true).
       with:

stack-9.10.yaml

@@ -1,4 +1,4 @@
-resolver: lts-24.7
+resolver: lts-24.37
 compiler: ghc-9.10.2
 compiler-check: match-exact
 

stack-9.12.yaml

@@ -1,4 +1,4 @@
-resolver: nightly-2025-08-30
+resolver: nightly-2026-04-15
 compiler: ghc-9.12.2
 compiler-check: match-exact