Update Kotlin to 1.9.20

[fzhinkin]

Kotlin version could not be easily updated to 1.9.20 as there are a few issues that have to be solved first:

• KMP no longer applies java plugin when jvm-target is configured, it applies only java-base-plugin (see KT-59595). This affects the animalsniffer plugin configuration;
• 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;
• KT-22841 introduced a warning for non-final actual classes having different super-types compared to its expect declaration. RawSink interface is affected (on JVM in implements java.io.Flushable). For now, we can annotate the actual definition with @AllowDifferentMembersInActual;
• Wasm tests required nodejs update. At the moment, there are only canary v21 builds, but mocha doesn't work with them.