Bump the dependencies group with 1 update

Bumps the dependencies group with 1 update: [actions/cache](https://github.com/actions/cache).


Updates `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
  dependency-group: dependencies
...

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

.github/workflows/maven-build-pr.yml

@@ -12,7 +12,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - name: Cache maven repository
-      uses: actions/cache@v3
+      uses: actions/cache@v4
       with:
         path: |
           ~/.m2/repository

.github/workflows/maven-build.yml

@@ -15,7 +15,7 @@ jobs:
     runs-on: ubuntu-20.04
     steps:
     - name: Cache maven repository
-      uses: actions/cache@v3
+      uses: actions/cache@v4
       with:
         path: |
           ~/.m2/repository