Bump actions/cache from 1 to 2.1.7

Bumps [actions/cache](https://github.com/actions/cache) from 1 to 2.1.7.
- [Release notes](https://github.com/actions/cache/releases)
- [Commits](actions/cache@v1...v2.1.7)

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

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

.github/workflows/maven.yml

@@ -36,7 +36,7 @@ jobs:
       with:
         java-version: 15
     - name: Cache Maven packages
-      uses: actions/cache@v1
+      uses: actions/cache@v2.1.7
       with:
         path: ~/.m2
         key: ${{ runner.os }}-m2-${{ hashFiles('**/pom.xml') }}
@@ -57,7 +57,7 @@ jobs:
           java-version: 15
 
       - name: Cache Maven packages
-        uses: actions/cache@v1
+        uses: actions/cache@v2.1.7
         with:
           path: ~/.m2
           key: ${{ runner.os }}-m2-${{ hashFiles('**/pom.xml') }}

.github/workflows/release.yml

@@ -38,7 +38,7 @@ jobs:
           java-version: 11
 
       - name: Cache Maven
-        uses: actions/cache@v1
+        uses: actions/cache@v2.1.7
         with:
           path: ~/.m2
           key: ${{ runner.os }}-m2-${{ hashFiles('**/pom.xml') }}