Bump actions/cache from 2.1.5 to 2.1.6

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](https://github.com/actions/cache/compare/v2.1.5...v2.1.6)

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

.github/workflows/build.yml

@@ -51,14 +51,14 @@ jobs:
 
       # Cache Gradle dependencies
       - name: Setup Gradle Dependencies Cache
-        uses: actions/cache@v2.1.5
+        uses: actions/cache@v2.1.6
         with:
           path: ~/.gradle/caches
           key: ${{ runner.os }}-gradle-caches-${{ hashFiles('**/*.gradle', '**/*.gradle.kts', 'gradle.properties') }}
 
       # Cache Gradle Wrapper
       - name: Setup Gradle Wrapper Cache
-        uses: actions/cache@v2.1.5
+        uses: actions/cache@v2.1.6
         with:
           path: ~/.gradle/wrapper
           key: ${{ runner.os }}-gradle-wrapper-${{ hashFiles('**/gradle/wrapper/gradle-wrapper.properties') }}
@@ -97,14 +97,14 @@ jobs:
 
       # Cache Gradle Dependencies
       - name: Setup Gradle Dependencies Cache
-        uses: actions/cache@v2.1.5
+        uses: actions/cache@v2.1.6
         with:
           path: ~/.gradle/caches
           key: ${{ runner.os }}-gradle-caches-${{ hashFiles('**/*.gradle', '**/*.gradle.kts', 'gradle.properties') }}
 
       # Cache Gradle Wrapper
       - name: Setup Gradle Wrapper Cache
-        uses: actions/cache@v2.1.5
+        uses: actions/cache@v2.1.6
         with:
           path: ~/.gradle/wrapper
           key: ${{ runner.os }}-gradle-wrapper-${{ hashFiles('**/gradle/wrapper/gradle-wrapper.properties') }}
@@ -160,14 +160,14 @@ jobs:
 
       # Cache Gradle Dependencies
       - name: Setup Gradle Dependencies Cache
-        uses: actions/cache@v2.1.5
+        uses: actions/cache@v2.1.6
         with:
           path: ~/.gradle/caches
           key: ${{ runner.os }}-gradle-caches-${{ hashFiles('**/*.gradle', '**/*.gradle.kts', 'gradle.properties') }}
 
       # Cache Gradle Wrapper
       - name: Setup Gradle Wrapper Cache
-        uses: actions/cache@v2.1.5
+        uses: actions/cache@v2.1.6
         with:
           path: ~/.gradle/wrapper
           key: ${{ runner.os }}-gradle-wrapper-${{ hashFiles('**/gradle/wrapper/gradle-wrapper.properties') }}
@@ -185,7 +185,7 @@ jobs:
 
       # Cache Plugin Verifier IDEs
       - name: Setup Plugin Verifier IDEs Cache
-        uses: actions/cache@v2.1.5
+        uses: actions/cache@v2.1.6
         with:
           path: ${{ steps.properties.outputs.pluginVerifierHomeDir }}/ides
           key: ${{ runner.os }}-plugin-verifier-${{ steps.properties.outputs.ideVersions }}