(🎁) Migrate to Gradle Kotlin property assignment

[KotlinIsland]

Hmm, where did the next branch go?🕵️‍♂️

This is draft until Gradle 8.1 is released.

[codecov-commenter]

Codecov Report

:exclamation: No coverage uploaded for pull request base (next@139730d). Click here to learn what that means. Patch has no changes to coverable lines.

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## next #357 +/- ## ======================================= Coverage ? 26.66% ======================================= Files ? 4 Lines ? 30 Branches ? 0 ======================================= Hits ? 8 Misses ? 22 Partials ? 0 ``` Help us with your feedback. Take ten seconds to tell us [how you rate us](https://about.codecov.io/nps?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=JetBrains). Have a feature suggestion? [Share it here.](https://app.codecov.io/gh/feedback/?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=JetBrains)

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[hsz]

next is already here.

Wow, this assignment is hot — finally! Thanks for the pr. 😊

[KotlinIsland]

@hsz We could merge this now and just not merge next into main until 8.1, or we could keep this as draft and only merge it into next when 8.1 is released. What do you think?

[hsz]

Let's keep it as it is util Gradle 8.1 becomes GA. You never know if a hotfix will appear in the meantime or not.

[hsz]

8.1 is here, merged. Thanks!