Bump actions/cache from v2 to v2.1.4

Bumps [actions/cache](https://github.com/actions/cache) from v2 to v2.1.4.
- [Release notes](https://github.com/actions/cache/releases)
- [Commits](actions/cache@v2...26968a0)

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

Author: dependabot[bot]

.github/workflows/ci.yml

@@ -32,7 +32,7 @@ jobs:
       with:
         java-version: ${{ matrix.java }}
     - name: Cache Gradle packages
-      uses: actions/cache@v2
+      uses: actions/cache@v2.1.4
       with:
         path: ~/.gradle/caches
         key: ${{ runner.os }}-gradle-${{ hashFiles('**/*.gradle') }}
@@ -59,7 +59,7 @@ jobs:
         with:
           java-version: ${{ matrix.java }}
       - name: Cache Gradle packages
-        uses: actions/cache@v2
+        uses: actions/cache@v2.1.4
         with:
           path: ~/.gradle/caches
           key: ${{ runner.os }}-gradle-${{ hashFiles('**/*.gradle') }}
@@ -92,7 +92,7 @@ jobs:
         with:
           java-version: 11
       - name: Cache Gradle packages
-        uses: actions/cache@v2
+        uses: actions/cache@v2.1.4
         with:
           path: ~/.gradle/caches
           key: ${{ runner.os }}-gradle-${{ hashFiles('**/*.gradle') }}