Replace mockito with mocktail

build.yaml

@@ -1,8 +1,3 @@
 targets:
   $default:
     builders:
-      # mockito's builder is expensive and is not needed until this package is
-      # migrated to null-safety. At that point, it should be scoped only to
-      # relevant files.
-      mockito:mockBuilder:
-        enabled: false

pubspec.yaml

@@ -20,7 +20,7 @@ dev_dependencies:
   dart_style: ^2.1.1
   dependency_validator: ^3.2.2
   matcher: ^0.12.10
-  mockito: ^5.3.1
+  mocktail: ^1.0.3
   test: ^1.16.8
 
 dependency_validator:

test/lifecycle_module_test.dart

@@ -17,7 +17,7 @@ import 'dart:async';
 
 import 'package:logging/logging.dart';
 import 'package:meta/meta.dart' show protected;
-import 'package:mockito/mockito.dart';
+import 'package:mocktail/mocktail.dart';
 import 'package:opentracing/noop_tracer.dart';
 import 'package:opentracing/opentracing.dart';
 import 'package:test/test.dart';