Change support for VM service message from "Dart VM Service listening" to "The Dart VM Service is listening"

lib/src/util.dart

@@ -44,7 +44,7 @@ Future<dynamic> retry(Future Function() f, Duration interval,
 /// Potentially useful as a means to extract it from log statements.
 Uri? extractVMServiceUri(String str) {
   final listeningMessageRegExp = RegExp(
-    r'(?:Observatory|Dart VM Service) listening on ((http|//)[a-zA-Z0-9:/=_\-\.\[\]]+)',
+    r'(?:Observatory|The Dart VM Service is) listening on ((http|//)[a-zA-Z0-9:/=_\-\.\[\]]+)',
   );
   final match = listeningMessageRegExp.firstMatch(str);
   if (match != null) {

test/util_test.dart

@@ -130,7 +130,8 @@ void main() {
     });
 
     test('handles new Dart VM service message format', () {
-      const msg = 'Dart VM Service listening on http://foo.bar:9999/cG90YXRv/';
+      const msg =
+          'The Dart VM Service is listening on http://foo.bar:9999/cG90YXRv/';
       expect(
           extractVMServiceUri(msg), Uri.parse('http://foo.bar:9999/cG90YXRv/'));
     });