chore: bump kotlin from 2.4.10 to 2.4.20 (#1083)

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gradle/libs.versions.toml

@@ -14,7 +14,7 @@ coroutines = "1.11.0"
 junit = "4.13.2"
 junit5 = "6.1.3"
 junitPlatform = "6.1.3"
-kotlin = "2.4.10"
+kotlin = "2.4.20"
 # standalone per KSP 2.0+ guidance — NOT kotlinVersion-kspVersion; easy
 # to miss during Kotlin upgrades since it no longer tracks the Kotlin version.
 ksp = "2.3.12"