Update actions/cache action to v5 (#136)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

.github/workflows/bump.yml

@@ -22,7 +22,7 @@ jobs:
 
       - name: Cache cabal store
         id: cache
-        uses: actions/cache/restore@v4
+        uses: actions/cache/restore@v5
         with:
           key: bump-action-cabal-store-${{ runner.os }}-${{ github.sha }}
           path: ~/.cabal/store
@@ -100,7 +100,7 @@ jobs:
           cabal build --only-dependencies --enable-tests --write-ghc-environment-files=always ${{ env.CABAL_FLAGS }}
 
       - name: Save cache
-        uses: actions/cache/save@v4
+        uses: actions/cache/save@v5
         if: always()
         with:
           key: ${{ steps.cache.outputs.cache-primary-key }}

.github/workflows/haskell-ci.yml

@@ -227,7 +227,7 @@ 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:
           if [ $((HCNUMVER < 81000)) -ne 0 ] ; then $CABAL v2-build $ARG_COMPILER --disable-tests --disable-benchmarks --constraint='servant ==0.16.*' all ; fi
       - 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