Bump actions/cache from 4.1.2 to 4.2.0

Bumps [actions/cache](https://github.com/actions/cache) from 4.1.2 to 4.2.0.
- [Release notes](https://github.com/actions/cache/releases)
- [Changelog](https://github.com/actions/cache/blob/main/RELEASES.md)
- [Commits](https://github.com/actions/cache/compare/v4.1.2...v4.2.0)

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

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

.github/workflows/cache.yml

@@ -36,7 +36,7 @@ jobs:
       - name: Cache runners svn-2-git-fhem mirror directory  
         # Some room for improvement because we create a new cache on every run where a new ref is fetched, this isn't very nice, normaly we need only the last one and it takes 7 days until they are deleted
         id: cache-fhem
-        uses: actions/cache@v4.1.2
+        uses: actions/cache@v4.2.0
         with:
           path: |
             ./src/fhem-mirror/.git

.github/workflows/mirror.yml

@@ -51,7 +51,7 @@ jobs:
       - name: Cache runners svn-2-git-fhem mirror directory  
         # Some room for improvement because we create a new cache on every run where a new ref is fetched, this isn't very nice, normaly weneed only the last one and it takes 7 days until they are deleted
         id: cache-fhem
-        uses: actions/cache@v4.1.2
+        uses: actions/cache@v4.2.0
         with:
           path: ./src/fhem-mirror/.git
           key: ${{ runner.os }}-fhemsvndir-${{ steps.get-date.outputs.timestamp }}