fix(Example): Upgrade kotlin to 2.3.*

[t0maboro]

Description

For RCA, please see: #4443 . We've internally discussed with @kkafar that the Kotlin upgrade should be safe because of their backward compatibility policy. This still diverges app from the RN template, but seems to be slightly better approach than applying the workaround with resolve RNS sources to its realpath.

Please note that bumping the kotlinVersion alone does nothing. The versionless KGP classpath entry resolves to the version pinned by @react-native/gradle-plugin that pins Kotlin 2.2.0, so the module kept compiling with Kotlin 2.2.* After pinning KGP explicitly, the resolved compiler is 2.3.*.

Changes

• upgrade Kotlin to 2.3, remove stale workaround

Before & after - visual documentation

N/A

Test plan

How to reproduce the issue:

1. Downgrade kotlin to 2.2
2. Build FabricExample
3. Make any edit in ScreenStackHeaderConfig.onUpdate
4. Build FabricExample again - the incremental compilation fails witj

e: file:///Users/tomaszboron/react-native-screens/FabricExample/node_modules/react-native-screens/android/src/main/java/com/swmansion/rnscreens/legacy/ScreenStackHeaderConfig.kt:35:71 Cannot access 'class PointerEventsBoxNoneImpl : ReactPointerEventsView': it is internal in file.
e: file:///Users/tomaszboron/react-native-screens/FabricExample/node_modules/react-native-screens/android/src/main/java/com/swmansion/rnscreens/legacy/ScreenStackHeaderConfig.kt:264:32 Cannot access 'fun trySetWindowTraits(screen: Screen, activity: Activity?, context: ReactContext?): Unit': it is internal in 'com/swmansion/rnscreens/legacy/ScreenWindowTraits'.
e: file:///Users/tomaszboron/react-native-screens/FabricExample/node_modules/react-native-screens/android/src/main/java/com/swmansion/rnscreens/legacy/ScreenStackHeaderConfig.kt:361:75 Cannot access 'var isHiddenBySearchBar: Boolean': it is internal in 'com/swmansion/rnscreens/legacy/ScreenStackHeaderSubview'.
e: file:///Users/tomaszboron/react-native-screens/FabricExample/node_modules/react-native-screens/android/src/main/java/com/swmansion/rnscreens/legacy/ScreenStackHeaderConfig.kt:362:22 Cannot access 'fun setHiddenBySearchBar(hidden: Boolean): Unit': it is internal in 'com/swmansion/rnscreens/legacy/ScreenStackHeaderSubview'.

This should NOT happen after changing the Kotlin version to 2.3

Checklist

• Included code example that can be used to test this change.
• For visual changes, included screenshots / GIFs / recordings documenting the change.
• For API changes, updated relevant public types.
• Ensured that CI passes

[kligarski]

Tested reproduction using this PR - build passed correctly after changes to onUpdate.

[kligarski]

Maybe we should add information that this pin can be removed when RN bumps Kotlin, similar to previous // TODO: Can be removed when RN ships Kotlin >= 2.3.0 which resolved the issue.. When somebody sees this randomly in a year or so it will have a higher chance of being cleaned up.

[kkafar]

+1 here

[kkafar]

Just a single request for a comment documenting when that code can be cleaned up again.

Thanks.

[kkafar]

+1 here