Update to KSP 2.2.20-2.0.4

Skipped 2.0.3 due to `ClassCastException`s

Author: freya022

gradle/libs.versions.toml

@@ -24,7 +24,7 @@ kotlin-logging = "7.0.3"
 kotlinx-coroutines = "1.10.2"
 kotlinx-datetime = "0.6.1"
 kotlinx-serialization = "1.9.0"
-ksp = "2.2.0-2.0.2"
+ksp = "2.2.20-2.0.4"
 logback-classic = "1.5.16"
 maven-publish-plugin = "0.34.0"
 mockk = "1.14.4"