.github/workflows/linux.yml in fluent-plugin-bigquery-2.3.0 vs .github/workflows/linux.yml in fluent-plugin-bigquery-3.0.0

@@ -7,10 +7,9 @@
     runs-on: ${{ matrix.os }}
     strategy:
       fail-fast: false
       matrix:
         ruby:
-          - 2.6
           - 2.7
           - 3.0
           - 3.1
         os:
           - ubuntu-latest