windows.yml in fluent-plugin-bigquery-3.0.0

- old
+ new

@@ -6,10 +6,13 @@
   build:
     runs-on: ${{ matrix.os }}
     strategy:
       fail-fast: false
       matrix:
-        ruby: [ '2.6', '2.7', '3.0', '3.1' ]
+        ruby:
+          - 2.7
+          - 3.0
+          - 3.1
         os:
           - windows-latest
     name: Ruby ${{ matrix.ruby }} unit testing on ${{ matrix.os }}
     steps:
     - uses: actions/checkout@v2