fix: remove nullability annotations to fix androidx jetifier issue

Author: fractalwrench

android/src/main/java/com/bugsnag/DiagnosticsCallback.java

@@ -5,8 +5,6 @@
 import com.bugsnag.android.Report;
 import com.bugsnag.android.Severity;
 
-import android.support.annotation.NonNull;
-
 import com.facebook.react.bridge.ReadableMap;
 import com.facebook.react.bridge.ReadableMapKeySetIterator;
 
@@ -92,7 +90,7 @@ Map<String, Object> readObjectMap(ReadableMap map) {
     }
 
     @Override
-    public void beforeNotify(@NonNull Report report) {
+    public void beforeNotify(Report report) {
         report.getNotifier().setName(NOTIFIER_NAME);
         report.getNotifier().setURL(NOTIFIER_URL);
         report.getNotifier().setVersion(String.format("%s (Android %s)",

android/src/main/java/com/bugsnag/JavaScriptException.java

@@ -2,8 +2,6 @@
 
 import com.bugsnag.android.JsonStream;
 
-import android.support.annotation.NonNull;
-
 import java.io.IOException;
 
 /**
@@ -24,7 +22,7 @@ class JavaScriptException extends Exception implements JsonStream.Streamable {
     }
 
     @Override
-    public void toStream(@NonNull JsonStream writer) throws IOException {
+    public void toStream(JsonStream writer) throws IOException {
         writer.beginObject();
         writer.name("errorClass").value(name);
         writer.name("message").value(getLocalizedMessage());