Update test for upcoming Analyzer change

PiperOrigin-RevId: 786680884

Author: iinozemtsev

test/builder/auto_mocks_test.dart

@@ -825,7 +825,7 @@ void main() {
  '''),
  _containsAllOf(
  'int get m => (super.noSuchMethod(',
- 'set m(int? _m) => super.noSuchMethod(',
+ 'set m(int? value) => super.noSuchMethod(',
  ),
  );
  });
@@ -2391,10 +2391,10 @@ void main() {
  ) as int);
  '''),
  dedent2('''
- set m(int? _m) => super.noSuchMethod(
+ set m(int? value) => super.noSuchMethod(
  Invocation.setter(
  #m,
- _m,
+ value,
  ),
  returnValueForMissingStub: null,
  );
@@ -2419,10 +2419,10 @@ void main() {
  ) as int);
  '''),
  dedent2('''
- set m(int? _m) => super.noSuchMethod(
+ set m(int? value) => super.noSuchMethod(
  Invocation.setter(
  #m,
- _m,
+ value,
  ),
  returnValueForMissingStub: null,
  );