Bump actions/cache from v1 to v2 (#132)

Bumps [actions/cache](https://github.com/actions/cache) from v1 to v2.
- [Release notes](https://github.com/actions/cache/releases)
- [Commits](actions/cache@v1...b820478)

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

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

.github/workflows/release.yml

@@ -12,7 +12,7 @@ jobs:
         uses: actions/checkout@master
 
       - name: Cache gems
-        uses: actions/cache@v1
+        uses: actions/cache@v2
         with:
           path: vendor/bundle
           key: 2.7-gems-${{ hashFiles('Gemfile.lock') }}

.github/workflows/test.yml

@@ -23,7 +23,7 @@ jobs:
         uses: actions/checkout@master
 
       - name: Cache gems
-        uses: actions/cache@v1
+        uses: actions/cache@v2
         with:
           path: vendor/bundle
           key: ${{ matrix.ruby }}-gems-${{ hashFiles('Gemfile.lock') }}