Bump build_test from 2.2.3 to 3.2.1 (#797)

Author: dependabot[bot]

pubspec.yaml

@@ -25,7 +25,7 @@ dependencies:
 
 dev_dependencies:
   build_runner: ^2.4.15
-  build_test: ^2.2.3
+  build_test: ">=2.2.3 <4.0.0"
   lints: ^6.0.0
   mockito: ^5.4.6
   path: ^1.9.1