Update kotlin

Author: renovate[bot]

gradle/libs.versions.toml

@@ -6,7 +6,7 @@
 # We cannot use 8.12.+ since it breaks F-Droid build (see https://github.com/element-hq/element-x-android/issues/3420#issuecomment-3199571010)
 android_gradle_plugin = "8.11.1"
 # When updateing this, please also update the version in the file ./idea/kotlinc.xml
-kotlin = "2.2.10"
+kotlin = "2.2.20"
 kotlinpoet = "2.2.0"
 ksp = "2.2.10-2.0.2"
 firebaseAppDistribution = "5.1.1"
@@ -34,7 +34,7 @@ accompanist = "0.37.3"
 test_core = "1.7.0"
 
 # Jetbrain
-datetime = "0.7.1"
+datetime = "0.7.1-0.6.x-compat"
 serialization_json = "1.9.0"
 
 #other