Bump kotest from 5.8.1 to 5.9.1 (#89)

Bumps `kotest` from 5.8.1 to 5.9.1.

Updates `io.kotest:kotest-assertions-core` from 5.8.1 to 5.9.1
- [Release notes](https://github.com/kotest/kotest/releases)
- [Commits](kotest/kotest@v5.8.1...v5.9.1)

Updates `io.kotest:kotest-assertions-json` from 5.8.1 to 5.9.1
- [Release notes](https://github.com/kotest/kotest/releases)
- [Commits](kotest/kotest@v5.8.1...v5.9.1)

---
updated-dependencies:
- dependency-name: io.kotest:kotest-assertions-core
  dependency-type: direct:production
  update-type: version-update:semver-minor
- dependency-name: io.kotest:kotest-assertions-json
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

gradle/libs.versions.toml

@@ -1,7 +1,7 @@
 [versions]
 gson = "2.10.1"
 kotlin = "2.0.0"
-kotest = "5.8.1"
+kotest = "5.9.1"
 dokka = "1.9.20"
 nexus-publish-gradle-plugin = "1.3.0"
 # The last version compatible with Java 8 is 0.13.2.