Bump io-event from 1.8.4 to 1.9.0 (#84)

Bumps [io-event](https://github.com/socketry/io-event) from 1.8.4 to 1.9.0.
- [Release notes](https://github.com/socketry/io-event/releases)
- [Changelog](https://github.com/socketry/io-event/blob/main/releases.md)
- [Commits](socketry/io-event@v1.8.4...v1.9.0)

---
updated-dependencies:
- dependency-name: io-event
  dependency-type: indirect
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Gemfile.lock

@@ -48,7 +48,7 @@ GEM
     http_parser.rb (0.8.0)
     i18n (1.14.7)
       concurrent-ruby (~> 1.0)
-    io-event (1.8.4)
+    io-event (1.9.0)
     jekyll (4.4.1)
       addressable (~> 2.4)
       base64 (~> 0.2)