Raise the build_web_compilers dependency max to v5.0.0

pubspec.yaml

@@ -13,7 +13,7 @@ dependencies:
 dev_dependencies:
   build_runner: ^2.1.2
   build_test: ^2.1.3
-  build_web_compilers: ^3.0.0
+  build_web_compilers: '>=3.0.0 <5.0.0'
   dart_dev: '>=3.6.5 <5.0.0'
   dependency_validator: ^3.2.0
   test: ^1.15.7