CI: simplify cache

While it might not be possible to invalidate the cache by changing test.yml, this should speed things up a lot due to `bundle i` taking most of the time.

.github/workflows/test.yml

@@ -35,17 +35,19 @@ jobs:
         uses: actions/cache@v1
         with:
           path: vendor/bundle
-          key: ${{ runner.os }}-ruby-v${{ matrix.ruby }}-${{ hashFiles('Gemfile') }}-${{ hashFiles('Gemfile.lock') }}-${{ hashFiles('.github/workflows/test.yml') }}
+          key: ${{ runner.os }}-ruby-v${{ matrix.ruby }}-${{ hashFiles('Gemfile') }}-${{ hashFiles('Gemfile.lock') }}
           restore-keys: |
-            ${{ runner.os }}-ruby-v${{ matrix.ruby }}-${{ hashFiles('Gemfile') }}-${{ hashFiles('Gemfile.lock') }}-${{ hashFiles('.github/workflows/test.yml') }}
+            ${{ runner.os }}-ruby-v${{ matrix.ruby }}-${{ hashFiles('Gemfile') }}-${{ hashFiles('Gemfile.lock') }}
+            ${{ runner.os }}-ruby-v${{ matrix.ruby }}-
 
       - name: Set up npm cache
         uses: actions/cache@v1
         with:
           path: ~/.npm
-          key: ${{ runner.os }}-node-v${{ matrix.node }}-${{ hashFiles('package.json') }}-${{ hashFiles('package-lock.json') }}-${{ hashFiles('.github/workflows/test.yml') }}
+          key: ${{ runner.os }}-node-v${{ matrix.node }}-${{ hashFiles('package.json') }}-${{ hashFiles('package-lock.json') }}
           restore-keys: |
-            ${{ runner.OS }}-node-v${{ matrix.node }}-${{ hashFiles('package.json') }}-${{ hashFiles('package-lock.json') }}-${{ hashFiles('.github/workflows/test.yml') }}
+            ${{ runner.OS }}-node-v${{ matrix.node }}-${{ hashFiles('package.json') }}-${{ hashFiles('package-lock.json') }}
+            ${{ runner.OS }}-node-v${{ matrix.node }}-
 
       - name: Set up Bundler
         run: gem install bundler -v "~> 1.17"