CI: update to actions/cache@v2

Author: XhmikosR

.github/workflows/ci.yml

@@ -34,7 +34,7 @@ jobs:
         run: 'echo "gem: --no-document" > ~/.gemrc'
 
       - name: Set up Ruby cache
-        uses: actions/cache@v1
+        uses: actions/cache@v2
         with:
           path: vendor/bundle
           key: ${{ runner.os }}-ruby-v${{ env.RUBY }}-${{ hashFiles('Gemfile') }}-${{ hashFiles('Gemfile.lock') }}
@@ -43,7 +43,7 @@ jobs:
             ${{ runner.os }}-ruby-v${{ env.RUBY }}-
 
       - name: Set up npm cache
-        uses: actions/cache@v1
+        uses: actions/cache@v2
         with:
           path: ~/.npm
           key: ${{ runner.os }}-node-v${{ env.NODE }}-${{ hashFiles('package.json') }}-${{ hashFiles('package-lock.json') }}