Warnings for depreciated API and unchecked/unsafe operations

[Jonny1987]

I get the following warnings when building my app:

Note: /home/john/.pub-cache/hosted/pub.dev/flutter_uxcam-2.5.3/android/src/main/java/com/uxcam/flutteruxcam/FlutterUxcamPlugin.java uses or overrides a deprecated API.
Note: Recompile with -Xlint:deprecation for details.
Note: /home/john/.pub-cache/hosted/pub.dev/flutter_uxcam-2.5.3/android/src/main/java/com/uxcam/flutteruxcam/FlutterUxcamPlugin.java uses unchecked or unsafe operations.
Note: Recompile with -Xlint:unchecked for details.