Update to Kotest 6.1.0 and refactor to align with updated API changes.

[sksamuel]

Kotest 6 was a major release with some small breaking changes to the API.
This PR updates the code and examples to reflect the changes.

[nedtwigg]

• Selfie breaks with Kotest 6 #554

Thanks very much for this implementation! Looks like you need to run ./gradlew spotlessApply and then push again. Assuming CI passes I'll be happy to merge and release.

I can update the changelogs myself, but I need an update to this file

• https://github.com/diffplug/selfie/blob/main/selfie.dev/src/pages/jvm/kotest.mdx#detailed-setup
• renders as https://selfie.dev/jvm/kotest

The AbstractProjectConfig stuff changed in Kotest 6, and those docs need to reflect that.

[sksamuel]

Spotless applied and docs updated. Let me know if you need further changes!

[sksamuel]

I must be missing something locally as it has been green locally each time. Hopefully this last commit has it fixed on CI too.

[nedtwigg]

fwiw:

selfie/.github/workflows/jvm-ci.yml

Line 35 in e306baa

- run: ./gradlew build --no-configuration-cache

The build can be a bit finnicky, tests that run tests seem to hit edge cases in Gradle.

[sksamuel]

Gotcha, no big deal if you don't mind hitting approve each time to run the tests :)

[sksamuel]

I got it to fail locally now.