Require analyzer 5.12.0

There was a recent change that added usage of the new `InvalidType` to
Mockito codegen, but it only appears in analyzer 5.12.

Fixes https://github.com/dart-lang/mockito/issues/656

PiperOrigin-RevId: 544605763
diff --git a/CHANGELOG.md b/CHANGELOG.md
index da207c6..20aeb15 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,7 @@
+## 5.4.3-wip
+
+* Require analyzer 5.12.0.
+
 ## 5.4.2
 
 * Require code_builder 4.5.0.
diff --git a/lib/src/version.dart b/lib/src/version.dart
index d7b0fe5..e0b6f30 100644
--- a/lib/src/version.dart
+++ b/lib/src/version.dart
@@ -1 +1 @@
-const packageVersion = '5.4.2';
+const packageVersion = '5.4.3-wip';
diff --git a/pubspec.yaml b/pubspec.yaml
index 578ccf2..6d27e78 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -1,5 +1,5 @@
 name: mockito
-version: 5.4.2
+version: 5.4.3-wip
 description: >-
   A mock framework inspired by Mockito with APIs for Fakes, Mocks,
   behavior verification, and stubbing.
@@ -9,7 +9,7 @@
   sdk: '>=2.19.0 <4.0.0'
 
 dependencies:
-  analyzer: '>=5.11.0 <6.0.0'
+  analyzer: '>=5.12.0 <6.0.0'
   build: '>=1.3.0 <3.0.0'
   code_builder: ^4.5.0
   collection: ^1.15.0