chore(deps): bump actions/cache from 4.3.0 to 6.0.0

Bumps [actions/cache](https://github.com/actions/cache) from 4.3.0 to 6.0.0.
- [Release notes](https://github.com/actions/cache/releases)
- [Changelog](https://github.com/actions/cache/blob/main/RELEASES.md)
- [Commits](actions/cache@0057852...2c8a9bd)

---
updated-dependencies:
- dependency-name: actions/cache
  dependency-version: 6.0.0
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

.github/workflows/casket-pages.yml

@@ -28,7 +28,7 @@ jobs:
           ghc-version: '9.8.2'
           cabal-version: '3.10'
       - name: Cache Cabal
-        uses: actions/cache@0057852bfaa89a56745cba8c7296529d2fc39830 # v4
+        uses: actions/cache@2c8a9bd7457de244a408f35966fab2fb45fda9c8 # v6.0.0
         with:
           path: |
             ~/.cabal/packages