Bump okio from 3.16.3 to 3.16.4

Bumps `okio` from 3.16.3 to 3.16.4.

Updates `com.squareup.okio:okio` from 3.16.3 to 3.16.4
- [Changelog](https://github.com/square/okio/blob/master/CHANGELOG.md)
- [Commits](square/okio@parent-3.16.3...parent-3.16.4)

Updates `com.squareup.okio:okio-nodefilesystem` from 3.16.3 to 3.16.4
- [Changelog](https://github.com/square/okio/blob/master/CHANGELOG.md)
- [Commits](square/okio@parent-3.16.3...parent-3.16.4)

---
updated-dependencies:
- dependency-name: com.squareup.okio:okio
  dependency-version: 3.16.4
  dependency-type: direct:production
  update-type: version-update:semver-patch
- dependency-name: com.squareup.okio:okio-nodefilesystem
  dependency-version: 3.16.4
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

gradle/libs.versions.toml

@@ -2,7 +2,7 @@
 kotlin = "2.2.21"
 kotest = "6.0.4"
 detekt = "1.23.8"
-okio = "3.16.3"
+okio = "3.16.4"
 serialization = "1.9.0"
 benchmark = "0.4.14"
 openapi = "2025.5"