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] <[email protected]>

Author: dependabot[bot]

.github/workflows/main.yml

@@ -54,7 +54,7 @@ jobs:
           cabal build all --dry-run
 
       - name: Restore cached dependencies
-        uses: actions/cache/restore@v4
+        uses: actions/cache/restore@v5
         id: cache
         env:
           key: ${{ runner.os }}-ghc-${{ steps.setup.outputs.ghc-version }}-cabal-${{ steps.setup.outputs.cabal-version }}
@@ -67,7 +67,7 @@ jobs:
         if: steps.cache.outputs.cache-hit != 'true'
         run: cabal build all --only-dependencies
       - name: Save cached dependencies
-        uses: actions/cache/save@v4
+        uses: actions/cache/save@v5
         if: steps.cache.outputs.cache-hit != 'true'
         with:
           path: ${{ steps.setup.outputs.cabal-store }}