build(deps): bump kotestAssertionsCore from 5.8.1 to 6.0.4

Bumps `kotestAssertionsCore` from 5.8.1 to 6.0.4.

Updates `io.kotest:kotest-assertions-core` from 5.8.1 to 6.0.4
- [Release notes](https://github.com/kotest/kotest/releases)
- [Commits](kotest/kotest@v5.8.1...6.0.4)

Updates `io.kotest:kotest-assertions-json` from 5.8.1 to 6.0.4
- [Release notes](https://github.com/kotest/kotest/releases)
- [Commits](kotest/kotest@v5.8.1...6.0.4)

---
updated-dependencies:
- dependency-name: io.kotest:kotest-assertions-core
  dependency-version: 6.0.4
  dependency-type: direct:production
  update-type: version-update:semver-major
- dependency-name: io.kotest:kotest-assertions-json
  dependency-version: 6.0.4
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

gradle/libs.versions.toml

@@ -43,7 +43,7 @@ jacksonDatabind = "2.18.2"
 javalite = "3.25.5"
 jsonassert = "1.5.0"
 kotest = "5.9.0" # Do not use 5.9.1 because it reverts the fix for https://github.com/kotest/kotest/issues/3981
-kotestAssertionsCore = "5.8.1"
+kotestAssertionsCore = "6.0.4"
 kotlin = "2.0.21"
 ktorVersion = "3.0.3"
 legacySupportV4 = "1.0.0"