Update fluentd to 1.17.1

The Windows build of google-fluentd is trying (and failing) to build fluentd 1.16.2 natively, which usually indicates that the version is incompatible with the Ruby upgrade (now at 3.3.5). Trying the latest version of fluentd...

fluent-plugin-google-cloud.gemspec

@@ -22,7 +22,7 @@ Gem::Specification.new do |gem|
   # NOTE: In order to update the Fluentd version, please update both here and
   # also the fluentd version in
   # https://github.com/GoogleCloudPlatform/google-fluentd/blob/master/config/software/fluentd.rb.
-  gem.add_runtime_dependency 'fluentd', '1.16.2'
+  gem.add_runtime_dependency 'fluentd', '1.17.1'
   gem.add_runtime_dependency 'google-api-client', '0.53.0'
   gem.add_runtime_dependency 'googleapis-common-protos', '1.4.0'
   gem.add_runtime_dependency 'googleauth', '1.3.0'