Upgrade fluentd to 1.19, Ruby to 3.2,grpc to 1.70.1

[lakshmansai]

Summary: Upgrade fluentd to 1.19, Ruby to 3.2, grpc to 1.70.1

Fix linting issues pointed by robocop.

Fixes #519

Test plan

bundle install

bundle exec rake


➜  fluent-plugin-google-cloud git:(upgrade_fluentd) ✗ bundle exec rake

Running RuboCop...
Inspecting 20 files
....................

20 files inspected, no offenses detected

Tip: Based on detected gems, the following RuboCop extension libraries might be helpful:
  * rubocop-rake (https://rubygems.org/gems/rubocop-rake)

You can opt out of this message by adding the following to your config (see https://docs.rubocop.org/rubocop/extensions.html#extension-suggestions for more options):
  AllCops:
    SuggestExtensions: false
/home/ubuntu/.rvm/rubies/ruby-3.2.2/bin/ruby -w -I"lib:lib:test" /home/ubuntu/.rvm/rubies/ruby-3.2.2/lib/ruby/gems/3.2.0/gems/rake-13.0.6/lib/rake/rake_test_loader.rb "test/plugin/asserts.rb" "test/plugin/base_test.rb" "test/plugin/constants.rb" "test/plugin/test_driver.rb" "test/plugin/test_filter_add_insert_ids.rb" "test/plugin/test_filter_analyze_config.rb" "test/plugin/test_out_google_cloud.rb" "test/plugin/test_out_google_cloud_grpc.rb" "test/plugin/utils.rb"
[Coveralls] Set up the SimpleCov formatter.
[Coveralls] Using SimpleCov's default settings.
/home/ubuntu/.rvm/gems/ruby-3.2.2/gems/io-event-1.10.2/lib/io/event/support.rb:48: warning: IO::Buffer is experimental and both the Ruby and C interface may change in the future!
/home/ubuntu/.rvm/gems/ruby-3.2.2/gems/fluentd-1.19.0/lib/fluent/plugin_helper.rb:46: warning: method redefined; discarding old inherited
/home/ubuntu/.rvm/gems/ruby-3.2.2/gems/fluentd-1.19.0/lib/fluent/plugin_helper.rb:46: warning: previous definition of inherited was here
/home/ubuntu/.rvm/gems/ruby-3.2.2/gems/google-apis-core-0.11.3/lib/google/apis/core/base_service.rb:228: warning: method redefined; discarding old client
/home/ubuntu/.rvm/gems/ruby-3.2.2/gems/google-cloud-logging-v2-0.11.0/lib/google/logging/v2/logging_pb.rb:25: warning: assigned but unused variable - e
/home/ubuntu/.rvm/gems/ruby-3.2.2/gems/google-cloud-logging-v2-0.11.0/lib/google/logging/v2/log_entry_pb.rb:24: warning: assigned but unused variable - e
/home/ubuntu/.rvm/gems/ruby-3.2.2/gems/google-cloud-logging-v2-0.11.0/lib/google/logging/v2/logging_config_pb.rb:24: warning: assigned but unused variable - e
/home/ubuntu/.rvm/gems/ruby-3.2.2/gems/google-cloud-logging-v2-0.11.0/lib/google/logging/v2/logging_metrics_pb.rb:24: warning: assigned but unused variable - e
Loaded suite /home/ubuntu/.rvm/rubies/ruby-3.2.2/lib/ruby/gems/3.2.0/gems/rake-13.0.6/lib/rake/rake_test_loader
Started
.../home/ubuntu/.rvm/gems/ruby-3.2.2/gems/google-cloud-trace-v2-0.7.0/lib/google/devtools/cloudtrace/v2/tracing_pb.rb:22: warning: assigned but unused variable - e
/home/ubuntu/.rvm/gems/ruby-3.2.2/gems/google-cloud-trace-v2-0.7.0/lib/google/devtools/cloudtrace/v2/trace_pb.rb:21: warning: assigned but unused variable - e
.............................................................................................................................................................................................................................................
Finished in 324.598372469 seconds.
--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
240 tests, 36418 assertions, 0 failures, 0 errors, 0 pendings, 0 omissions, 0 notifications
100% passed
--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
0.74 tests/s, 112.19 assertions/s
[Coveralls] Outside the CI environment, not sending data.
WARNING: All log messages before absl::InitializeLog() is called are written to STDERR

Build gem

rake build

[google-cla]

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[lakshmansai]

cc @jefferbrecht

[lakshmansai]

cc @jefferbrecht
Can you PTAL