CI: Add Ruby 3.2 for Windows

[ashie]

Which issue(s) this PR fixes:
N/A

What this PR does / why we need it:

Docs Changes:
N/A

Release Note:
N/A

[ashie]

https://github.com/fluent/fluentd/actions/runs/3803799266/jobs/6471387041

Oops, it's not available on setup-ruby yet:

Error: Error: Unknown version 3.2 for ruby on windows-2022

[ashie]

https://github.com/fluent/fluentd/actions/runs/3803799266/jobs/6471387041

Oops, it's not available on setup-ruby yet:

Error: Error: Unknown version 3.2 for ruby on windows-2022

Now it's available.

[ashie]

Although CI is failed on Ruby 3.2 on Windows, we'll fix it in another PR after merging this.
(#3987 might resolve it.)

Other 2 failed tests on Ruby head isn't related with this, it occurs on all platforms:
https://github.com/fluent/fluentd/actions/runs/3803799266/jobs/6545946809
Probably something changed in Ruby head (3.3+).