[Fix] Update targetSdk to 34 from 33.

[notandyvee]

Update targetSdkVersion from 33 to 34 (Android 14)

Part of https://github.com/wordpress-mobile/WordPress-Login-Flow-Android/issues/130

Test

• [ ] Checkout this branch
• [ ] Use this branch through WP (uncomment localLoginFlowPath in local-builds.gradle)
• [ ] Log out if already logged in
• [ ] Try out Login flow
• [ ] Ensure, no issues or crashes

[notandyvee]

Hey @irfano if you have time to review this one 🙏🏻