build(deps): bump nio4r from 2.5.9 to 2.6.0

Bumps [nio4r](https://github.com/socketry/nio4r) from 2.5.9 to 2.6.0.
- [Changelog](https://github.com/socketry/nio4r/blob/main/changes.md)
- [Commits](socketry/nio4r@v2.5.9...v2.6.0)

---
updated-dependencies:
- dependency-name: nio4r
  dependency-type: indirect
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

Gemfile.lock

@@ -181,7 +181,7 @@ GEM
       timeout
     net-smtp (0.4.0)
       net-protocol
-    nio4r (2.5.9)
+    nio4r (2.6.0)
     nokogiri (1.15.4)
       mini_portile2 (~> 2.8.2)
       racc (~> 1.4)