chore: upgrade to gradle 8.5

Issue \

Upgrades the build system to Gradle 8.5.
Upgrades Kotlin to 1.9.21 bug fix release
1.9.20 requires to specify a -Xexpect-actual-classes flag to suppress warnings about expect/actual classes;
it'll be prohibited to use default arguments in expect declarations actualized with typealises; we actively use it for exception classes;
Remove the DSL_SCOPE_VIOLATION suppression, from the ticket and testing locally this seems resolved
upgrade atomic-fu to 0.23.1 and remove explicit dependency on it (plugin adds correct target dependencies depending on plugin settings)
add kotlin-stdlib dependencies, they aren't actually builtin and require stdlib to be on classpath

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