build.gradle.kts: Bump versionCode to 21 and versionName to 2.3.5

Author: adamff-dev

app/build.gradle.kts

@@ -12,8 +12,8 @@ android {
         minSdk = 29
         //noinspection OldTargetApi
         targetSdk = 34
-        versionCode = 20
-        versionName = "2.3.4"
+        versionCode = 21
+        versionName = "2.3.5"
 
         testInstrumentationRunner = "androidx.test.runner.AndroidJUnitRunner"
     }