build: bump actions/cache from 2.1.6 to 2.1.7 (#446)

Bumps [actions/cache](https://github.com/actions/cache) from 2.1.6 to 2.1.7.
- [Release notes](https://github.com/actions/cache/releases)
- [Commits](actions/cache@v2.1.6...v2.1.7)

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

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

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

.github/workflows/dependency-update.yml

@@ -12,7 +12,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v2
-      - uses: actions/[email protected].6
+      - uses: actions/[email protected].7
         with:
           path: ~/.gradle/caches
           key: ${{ runner.os }}-gradle-${{ hashFiles('**/*.gradle') }}

.github/workflows/graalvm.yml

@@ -29,7 +29,7 @@ jobs:
          sudo apt-get clean
          df -h    
       - uses: actions/checkout@v2
-      - uses: actions/[email protected].6
+      - uses: actions/[email protected].7
         with:
           path: ~/.gradle/caches
           key: ${{ runner.os }}-gradle-${{ hashFiles('**/*.gradle') }}

.github/workflows/gradle.yml

@@ -29,7 +29,7 @@ jobs:
          sudo apt-get clean
          df -h
       - uses: actions/checkout@v2
-      - uses: actions/[email protected].6
+      - uses: actions/[email protected].7
         with:
           path: ~/.gradle/caches
           key: ${{ runner.os }}-gradle-${{ hashFiles('**/*.gradle') }}

.github/workflows/publish-snapshot.yml

@@ -11,7 +11,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v2
-      - uses: actions/[email protected].6
+      - uses: actions/[email protected].7
         with:
           path: ~/.gradle/caches
           key: ${{ runner.os }}-gradle-${{ hashFiles('**/*.gradle') }}