build(deps): bump actions/cache from 3 to 4

Bumps [actions/cache](https://github.com/actions/cache) from 3 to 4.
- [Release notes](https://github.com/actions/cache/releases)
- [Changelog](https://github.com/actions/cache/blob/main/RELEASES.md)
- [Commits](actions/cache@v3...v4)

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

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

.github/workflows/github-page.yml

@@ -45,7 +45,7 @@ jobs:
         # we need unpublished `cabal` version to support sublibraries
         cabal-version: 'head'
 
-    - uses: actions/cache@v3
+    - uses: actions/cache@v4
       name: Cache cabal store
       with:
         path: ${{ steps.setup-haskell.outputs.cabal-store }}