Bump SDK to 2.17 and code_builder to 4.3.0

Author: srawlins

pubspec.yaml

@@ -6,12 +6,12 @@ description: >-
 repository: https://github.com/dart-lang/mockito
 
 environment:
-  sdk: '>=2.12.0-0 <3.0.0'
+  sdk: '>=2.17.0-0 <3.0.0'
 
 dependencies:
   analyzer: '>=4.6.0 <5.0.0'
   build: '>=1.3.0 <3.0.0'
-  code_builder: ^4.2.0
+  code_builder: ^4.3.0
   collection: ^1.15.0
   dart_style: '>=1.3.6 <3.0.0'
   matcher: ^0.12.10