Bump actions/cache from 4.2.3 to 4.2.4 (#38)

Bumps [actions/cache](https://github.com/actions/cache) from 4.2.3 to 4.2.4.
- [Release notes](https://github.com/actions/cache/releases)
- [Changelog](https://github.com/actions/cache/blob/main/RELEASES.md)
- [Commits](actions/cache@v4.2.3...v4.2.4)

---
updated-dependencies:
- dependency-name: actions/cache
  dependency-version: 4.2.4
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

.github/workflows/ci.yml

@@ -38,7 +38,7 @@ jobs:
         uses: actions/[email protected]
 
       - name: Cache Swift PM
-        uses: actions/[email protected].3
+        uses: actions/[email protected].4
         with:
           path: .build
           key: ${{ runner.os }}-${{ matrix.swift }}-ci-spm-${{ hashFiles('Package.swift') }}