Bump okio from 3.12.0 to 3.13.0

Bumps `okio` from 3.12.0 to 3.13.0.

Updates `com.squareup.okio:okio` from 3.12.0 to 3.13.0
- [Release notes](https://github.com/square/okio/releases)
- [Changelog](https://github.com/square/okio/blob/master/CHANGELOG.md)
- [Commits](square/okio@parent-3.12.0...parent-3.13.0)

Updates `com.squareup.okio:okio-nodefilesystem` from 3.12.0 to 3.13.0
- [Release notes](https://github.com/square/okio/releases)
- [Changelog](https://github.com/square/okio/blob/master/CHANGELOG.md)
- [Commits](square/okio@parent-3.12.0...parent-3.13.0)

---
updated-dependencies:
- dependency-name: com.squareup.okio:okio
  dependency-version: 3.13.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
- dependency-name: com.squareup.okio:okio-nodefilesystem
  dependency-version: 3.13.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

gradle/libs.versions.toml

@@ -3,7 +3,7 @@ kotlin = "2.1.21"
 kotest = "6.0.0.M3"
 detekt = "1.23.8"
 ktlint = "1.1.0"
-okio = "3.12.0"
+okio = "3.13.0"
 serialization = "1.8.1"
 benchmark = "0.4.14"
 openapi = "2025.3"