fluent-plugin-google-cloud requires outdated Fluentd 1.13.3 back from 2021

[SehiiRohoza]

Hello,

I tried to use fluent-plugin-google-cloud with Fluentd with the most recent version 1.15, but found that it's not possible:

As it turned out that fluent-plugin-google-cloud 0.12.9 released on the 18th of January 2023 has strong dependency on Fluentd 1.13.3 accordingly to https://rubygems.org/gems/fluent-plugin-google-cloud:

RUNTIME DEPENDENCIES (10):
fluentd = 1.13.3

and at luent-plugin-google-cloud.gemspec:

gem.add_runtime_dependency 'fluentd', '1.13.3'

which was released on the 27th of July back in 2021. So it'll be soon two years old.

Could you please fix it and switch to the most recent version of Flunetd or at least somewhat half a year old one?