Failed to use with Ruby 3.x due to outdated google-api-client 0.30.8

[cosmo0920]

When I try to use this plugin with Ruby 3.0.2, I got the following error:

Resolving dependencies.....
Bundler found conflicting requirements for the Ruby version:
  In Gemfile:
    Ruby

    ffi was resolved to 1.15.3, which depends on
      Ruby (>= 2.3)

    fluent-plugin-detect-exceptions (~> 0.0.13) was resolved to 0.0.13, which depends on
      Ruby (>= 2.0)

    fluent-plugin-google-cloud (= 0.12.0) was resolved to 0.12.0, which depends on
      Ruby (>= 2.2)

    fluent-plugin-kubernetes_metadata_filter (~> 2.7.1) was resolved to 2.7.2, which depends on
      Ruby (>= 2.5.0)

    fluent-plugin-google-cloud (= 0.12.0) was resolved to 0.12.0, which depends on
      fluentd (= 1.13.3) was resolved to 1.13.3, which depends on
        Ruby (>= 2.4)

    fluent-plugin-google-cloud (= 0.12.0) was resolved to 0.12.0, which depends on
      google-api-client (= 0.30.8) was resolved to 0.30.8, which depends on
        Ruby (~> 2.0)