Bump actions/cache from 3 to 4 (#138)

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] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

.github/workflows/maven-build.yml

@@ -25,7 +25,7 @@ jobs:
         java-version: 17
 
     - name: Cache maven repository
-      uses: actions/cache@v3
+      uses: actions/cache@v4
       with:
         # npm cache files are stored in `~/.npm` on Linux/macOS
         path: ~/.m2/repository

.github/workflows/maven-deploy.yml

@@ -36,7 +36,7 @@ jobs:
         java-version: 17
 
     - name: Cache maven repository
-      uses: actions/cache@v3
+      uses: actions/cache@v4
       with:
         # npm cache files are stored in `~/.npm` on Linux/macOS
         path: ~/.m2/repository