Bump actions/cache from 2.1.4 to 2.1.6

Bumps [actions/cache](https://github.com/actions/cache) from 2.1.4 to 2.1.6.
- [Release notes](https://github.com/actions/cache/releases)
- [Commits](actions/cache@v2.1.4...v2.1.6)

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

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

Author: dependabot[bot]

.github/workflows/codeql-analysis.yml

@@ -42,7 +42,7 @@ jobs:
         languages: ${{ matrix.language }}
 
     # Cache build process too like in the maven config
-    - uses: actions/cache@v2.1.4
+    - uses: actions/cache@v2.1.6
       with:
         path: ~/.m2/repository
         key: ${{ runner.os }}-maven-${{ hashFiles('**/pom.xml') }}

.github/workflows/maven.yml

@@ -31,7 +31,7 @@ jobs:
       # Nevertheless the repositories should be more stable and it makes no sense to pull
       # a same version every time
       # A dry run would make more sense
-      - uses: actions/cache@v2.1.4
+      - uses: actions/cache@v2.1.6
         with:
           path: ~/.m2/repository
           key: ${{ runner.os }}-maven-${{ hashFiles('**/pom.xml') }}