Unchecked conversion warnings on the build time

[ttypic]

When building a Flutter project that depends on ably_flutter, Android compilation prints multiple unchecked conversion warnings in AuthMethodHandler.java:

.pub-cache/hosted/pub.dev/ably_flutter-1.2.41/android/src/main/java/io/ably/flutter/plugin/AuthMethodHandler.java:30: warning: [unchecked] unchecked conversion
final AblyFlutterMessage<Map<String, Object>> ablyMessage = (AblyFlutterMessage) methodCall.arguments;
^
required: AblyFlutterMessage<Map<String,Object>>
found: AblyFlutterMessage
.pub-cache/hosted/pub.dev/ably_flutter-1.2.41/android/src/main/java/io/ably/flutter/plugin/AuthMethodHandler.java:57: warning: [unchecked] unchecked conversion
final AblyFlutterMessage<Map<String, Object>> ablyMessage = (AblyFlutterMessage) methodCall.arguments;
^
required: AblyFlutterMessage<Map<String,Object>>
found: AblyFlutterMessage
.pub-cache/hosted/pub.dev/ably_flutter-1.2.41/android/src/main/java/io/ably/flutter/plugin/AuthMethodHandler.java:76: warning: [unchecked] unchecked conversion
final AblyFlutterMessage<Map<String, Object>> ablyMessage = (AblyFlutterMessage) methodCall.arguments;

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