chore: fix ruby github action

.github/workflows/fastlane.yml

@@ -14,10 +14,8 @@ jobs:
     - name: Set outputs
       id: vars
       run: echo "::set-output name=sha_short::$(git rev-parse --short HEAD)"
-    - name: Set up Ruby 2.7
+    - name: Set up Ruby
       uses: ruby/setup-ruby@v1
-      with:
-        ruby-version: 2.7
     - name: Install fastlane
       run: bundle install -j 6
     - name: Install Node dependencies