CI: Update CI

[daipom]

Update Ruby and Fluentd versions and so on.

I fixed to run the tests on the latest Fluentd, but should we add some Fluentd versions as before?
If so, I will fix it.

And, should we create a gem test instead of the following steps?
(Like https://github.com/fluent-plugins-nursery/fluent-plugin-out-http/blob/master/.github/workflows/test.yml)

        rake build
        gem install ./pkg/fluent-plugin-utmpx*.gem

If so, I will make the PR following this.

[kenhys]

I fixed to run the tests on the latest Fluentd, but should we add some Fluentd versions as before?
If so, I will fix it.

When I created this gem, targeting a specific version of fluentd, but currently, it is enough to work
with packaged version in td-agent.
Thus, targeting the latest fluentd seems enough to test it, IMHO

[kenhys]

LGTM.

[kenhys]

If so, I will make the PR following this.

Welcome PR to simplify testing task in another PR.

[daipom]

I see! Thanks for your review!

[ashie]

When I created this gem, targeting a specific version of fluentd,

This is because this plugin depends on in_tail/position_file.rb in fluentd.
There are incompatible changes between 1.11 and 1.12 in this class.

I think in_tail/position_file is considered as a private utility for in_tail, so fluent-plugin-utmpx shouldn't use it.

[daipom]

I see! Thanks!

[daipom]

Sorry, I didn't notice that Bundler was still choosing Fluentd v1.12.

https://github.com/fluent-plugins-nursery/fluent-plugin-utmpx/actions/runs/4201345210/jobs/7288262037#step:3:69

The current test doesn't work with the latest Fluentd, I will see this more.