upgrade ruby version

Author: Binod Adhikary

.github/workflows/build.yml

@@ -47,7 +47,7 @@ jobs:
       if: ${{ env.ANDROID_SECRETS_KEY }}
       uses: ruby/setup-ruby@v1
       with:
-        ruby-version: 2.6
+        ruby-version: 2.7
 
     - name: Set up Fastlane
       if: ${{ env.ANDROID_SECRETS_KEY }}

.github/workflows/publish.yml

@@ -31,7 +31,7 @@ jobs:
     - name: Set up Ruby
       uses: ruby/setup-ruby@v1
       with:
-        ruby-version: 2.6
+        ruby-version: 2.7
 
     - name: Set up Fastlane
       run: gem install fastlane --no-document --quiet