Bump actions/cache from 4 to 5

Bumps [actions/cache](https://github.com/actions/cache) from 4 to 5.
- [Release notes](https://github.com/actions/cache/releases)
- [Changelog](https://github.com/actions/cache/blob/main/RELEASES.md)
- [Commits](actions/cache@v4...v5)

---
updated-dependencies:
- dependency-name: actions/cache
  dependency-version: '5'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

.github/workflows/haskell-ci.yml

@@ -265,7 +265,7 @@ jobs:
           $CABAL v2-build $ARG_COMPILER $ARG_TESTS $ARG_BENCH --dry-run all
           cabal-plan
       - name: restore cache
-        uses: actions/cache/restore@v4
+        uses: actions/cache/restore@v5
         with:
           key: ${{ runner.os }}-${{ matrix.compiler }}-${{ github.sha }}
           path: ~/.cabal/store
@@ -296,7 +296,7 @@ jobs:
           $CABAL v2-build $ARG_COMPILER --disable-tests --disable-benchmarks all
       - name: save cache
         if: always()
-        uses: actions/cache/save@v4
+        uses: actions/cache/save@v5
         with:
           key: ${{ runner.os }}-${{ matrix.compiler }}-${{ github.sha }}
           path: ~/.cabal/store

.github/workflows/stack.yml

@@ -105,7 +105,7 @@ jobs:
         enable-stack: true
 
     - name: Restore cache dependencies
-      uses: actions/cache/restore@v4
+      uses: actions/cache/restore@v5
       id: cache
       env:
         key: ${{ runner.os }}-stack-${{ steps.setup.outputs.stack-version }}-ghc-${{ steps.setup.outputs.ghc-version }}
@@ -132,7 +132,7 @@ jobs:
         stack exec ${ARGS} -- fix-whitespace --check
 
     - name: Cache dependencies
-      uses: actions/cache/save@v4
+      uses: actions/cache/save@v5
       if:   always() && steps.cache.outputs.cache-hit != 'true'
       with:
         path: ${{ steps.setup.outputs.stack-root }}