Update fastlane.yml

.github/workflows/fastlane.yml

@@ -10,10 +10,10 @@ jobs:
     - name: Set outputs
       id: vars
       run: echo "::set-output name=sha_short::$(git rev-parse --short HEAD)"
-    - name: Set up Ruby 2.6
+    - name: Set up Ruby 2.7
       uses: actions/setup-ruby@v1
       with:
-        ruby-version: 2.7.x
+        ruby-version: 2.7
     - name: Install fastlane
       run: bundle install -j 6
     - name: Install Node dependencies