Bump actions/cache from 2.1.3 to 2.1.6 (#4162)

Bumps [actions/cache](https://github.com/actions/cache) from 2.1.3 to 2.1.6.
- [Release notes](https://github.com/actions/cache/releases)
- [Commits](actions/cache@v2.1.3...v2.1.6)

Signed-off-by: dependabot[bot] <[email protected]>

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

Author: dependabot[bot]

.github/workflows/ci-examples.yml

@@ -19,7 +19,7 @@ jobs:
         with:
           java-version: '1.8'
       - name: Cache Gradle Home files
-        uses: actions/[email protected].3
+        uses: actions/[email protected].6
         continue-on-error: true
         with:
           path: ~/.gradle/caches
@@ -46,7 +46,7 @@ jobs:
         with:
           java-version: '1.8'
       - name: Cache Gradle Home files
-        uses: actions/[email protected].3
+        uses: actions/[email protected].6
         continue-on-error: true
         with:
           path: ~/.gradle/caches

.github/workflows/ci.yml

@@ -19,7 +19,7 @@ jobs:
         with:
           java-version: '1.8'
       - name: Cache Gradle Home files
-        uses: actions/[email protected].3
+        uses: actions/[email protected].6
         with:
           path: ~/.gradle/caches
           key: ${{ runner.os }}-gradle-home-testmatrix-${{ hashFiles('**/*.gradle') }}
@@ -44,7 +44,7 @@ jobs:
         with:
           java-version: '1.8'
       - name: Cache Gradle Home files
-        uses: actions/[email protected].3
+        uses: actions/[email protected].6
         continue-on-error: true
         with:
           path: ~/.gradle/caches