Release for v0.9.0

[github-actions]

This pull request is for the next release as v0.9.0 created by tagpr. Merging it will tag v0.9.0 to the merge commit and create a GitHub release.

You can modify this branch "tagpr-from-v0.8.0" directly before merging if you want to change the next version number or other files for the release.

How to change the next version as you like

There are two ways to do it.

• Version file
  • Edit and commit the version file specified in the .tagpr configuration file to describe the next version
  • If you want to use another version file, edit the configuration file.
• Labels convention
  • Add labels to this pull request like "tagpr:minor" or "tagpr:major"
  • If no conventional labels are added, the patch version is incremented as is.

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What's Changed

Other Changes

• Bump up version of golang.org/x/sync by @k1LoW in Bump up version of golang.org/x/sync #41
• In cases within OnRequestLimit, I want to execute next. by @pyama86 in In cases within OnRequestLimit, I want to execute next. #43

Full Changelog: v0.8.0...v0.9.0