deps: Update Kotlin to version 2.1.20

This requires to update the KSP plugin at the same time.

Signed-off-by: Sebastian Schuberth <[email protected]>

Author: renovate[bot]

gradle/libs.versions.toml

@@ -1,8 +1,8 @@
 [versions]
 detektPlugin = "1.23.8"
 ideaExtPlugin = "1.1.10"
-kotlinPlugin = "2.1.10"
-kspPlugin = "2.1.10-1.0.31"
+kotlinPlugin = "2.1.20"
+kspPlugin = "2.1.20-1.0.31"
 shadowPlugin = "8.3.6"
 
 kotest = "5.9.1"