Bump actions/cache from 2.1.5 to 2.1.6 (#88)

Bumps [actions/cache](/~https://github.com/actions/cache) from 2.1.5 to 2.1.6.
- [Release notes](/~https://github.com/actions/cache/releases)
- [Commits](actions/cache@v2.1.5...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>

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

.github/workflows/build.yml

@@ -29,7 +29,7 @@ jobs:
 
       # Cache all the things
       - name: Cache SonarCloud packages
-        uses: actions/cache@v2.1.5
+        uses: actions/cache@v2.1.6
         if: ${{ env.SONAR_TOKEN != null && env.SONAR_TOKEN != '' && matrix.java_version == '11' }}
         env:
           SONAR_TOKEN: ${{ secrets.SONAR_TOKEN }}
@@ -39,7 +39,7 @@ jobs:
           restore-keys: ${{ runner.os }}-sonar
 
       - name: Cache Maven packages
-        uses: actions/cache@v2.1.5
+        uses: actions/cache@v2.1.6
         with:
           path: ~/.m2
           key: ${{ runner.os }}-m2-${{ hashFiles('**/pom.xml') }}