Bump actions/cache from 3 to 4 in /.github/workflows

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-version: '4'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

.github/workflows/build.yml

@@ -32,7 +32,7 @@ jobs:
           echo "RELEASE_TAG=v$(date +'%Y.%m.%d')" >> $GITHUB_ENV
 
       - name: Cache Pacman packages
-        uses: actions/cache@v3
+        uses: actions/cache@v4
         with:
           path: ${{ env.PACMAN_CACHE }}
           key: archlinux-pacman-${{ github.run_id }}