bump(android): kotlin language version from 1.4 to 1.6 (#2456)

* bump

* update changelog

* fix changelog

Author: buenaflor

CHANGELOG.md

@@ -55,6 +55,7 @@
 - Catch errors thrown during `handleBeginFrame` and `handleDrawFrame` ([#2446](https://github.com/getsentry/sentry-dart/pull/2446))
 - OS & device contexts missing on Windows ([#2439](https://github.com/getsentry/sentry-dart/pull/2439))
 - Native iOS/macOS SDK session didn't start after Flutter hot-restart ([#2452](https://github.com/getsentry/sentry-dart/pull/2452))
+- Kotlin 2.1.0 compatibility on Android, bump Kotlin language version from `1.4` to `1.6` ([#2456](https://github.com/getsentry/sentry-dart/pull/2456))
 
 ### Dependencies
 

flutter/android/build.gradle

@@ -55,7 +55,7 @@ android {
     }
     kotlinOptions {
         jvmTarget = JavaVersion.VERSION_1_8
-        languageVersion = "1.4"
+        languageVersion = "1.6"
     }
 }