Update tooltip_theme_test to unblock Dart SDK roll (#59937)

packages/flutter/test/material/tooltip_theme_test.dart

@@ -65,6 +65,8 @@ void main() {
 
   testWidgets('TooltipThemeData implements debugFillProperties', (WidgetTester tester) async {
     final DiagnosticPropertiesBuilder builder = DiagnosticPropertiesBuilder();
+    const Duration wait = Duration(milliseconds: 100);
+    const Duration show = Duration(milliseconds: 200);
     const TooltipThemeData(
       height: 15.0,
       padding: EdgeInsets.all(20.0),
@@ -73,8 +75,8 @@ void main() {
       excludeFromSemantics: true,
       decoration: BoxDecoration(color: Color(0xffffffff)),
       textStyle: TextStyle(decoration: TextDecoration.underline),
-      waitDuration: Duration(milliseconds: 100),
-      showDuration: Duration(milliseconds: 200),
+      waitDuration: wait,
+      showDuration: show,
     ).debugFillProperties(builder);
 
     final List<String> description = builder.properties
@@ -90,8 +92,8 @@ void main() {
       'semantics: excluded',
       'decoration: BoxDecoration(color: Color(0xffffffff))',
       'textStyle: TextStyle(inherit: true, decoration: TextDecoration.underline)',
-      'wait duration: 0:00:00.100000',
-      'show duration: 0:00:00.200000',
+      'wait duration: ${wait.toString()}',
+      'show duration: ${show.toString()}',
     ]);
   });