resolve unnecessary dependency in git_release role (#623)

### Feature or Bugfix
- Bugfix

### Detail
- Remove small bug on the way we define the git release role - managed
policies are attached after role creation
- NOTE: The fix is already included in the `modularization-main` branch

### Relates
-  #617 

By submitting this pull request, I confirm that my contribution is made
under the terms of the Apache 2.0 license.

deploy/stacks/pipeline.py

@@ -331,7 +331,6 @@ def set_codebuild_iam_roles(self):
                     iam.ServicePrincipal('codebuild.amazonaws.com'),
                     iam.AccountPrincipal(self.account),
                 ),
-                managed_policies=[self.baseline_codebuild_policy, self.git_release_policy, self.expanded_codebuild_policy]
             )
             self.expanded_codebuild_policy.attach_to_role(self.git_project_role)
             self.baseline_codebuild_policy.attach_to_role(self.git_project_role)