fix: `moreOrLessEquals` does not allow `actual` to be integers (#125599)

Close https://github.com/flutter/flutter/issues/125600

packages/flutter_test/lib/src/matchers.dart

@@ -1444,7 +1444,7 @@ class _MoreOrLessEquals extends Matcher {
 
   @override
   bool matches(dynamic object, Map<dynamic, dynamic> matchState) {
-    if (object is! double) {
+    if (object is! num) {
       return false;
     }
     if (object == value) {

packages/flutter_test/test/matchers_test.dart

@@ -214,6 +214,9 @@ void main() {
 
     expect(11.0, moreOrLessEquals(-11.0, epsilon: 100.0));
     expect(-11.0, moreOrLessEquals(11.0, epsilon: 100.0));
+
+    expect(0, moreOrLessEquals(0.0));
+    expect(0.0, moreOrLessEquals(0));
   });
 
   test('matrixMoreOrLessEquals', () {