Update kotlin monorepo to v2.2.20

Author: renovate[bot]

gradle/libs.versions.toml

@@ -2,7 +2,7 @@
 agp = "8.13.0"               # keep in sync with android-tools
 android-tools = "31.13.0"    # = 23.0.0 + agp
 compilerTesting = "0.7.1"
-kotlin = "2.1.20"
+kotlin = "2.2.20"
 kotlinPoet = "1.13.1"
 ksp = "2.1.20-1.0.32"
 ktlint = "0.46.1"