add codecommit:GitPull permissions (#1851)

### Feature or Bugfix
- Bugfix

### Detail
Adding missing permission codecommit:GitPull in codebuild role

### Relates
Resolve #1840 


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under the terms of the Apache 2.0 license.

Author: petrkalos

deploy/stacks/pipeline.py

@@ -335,6 +335,7 @@ def set_codebuild_iam_roles(self):
                     'codeartifact:GetAuthorizationToken',
                     'codeartifact:GetRepositoryEndpoint',
                     'codeartifact:ReadFromRepository',
+                    'codecommit:GitPull',
                     'ecr:GetDownloadUrlForLayer',
                     'ecr:BatchGetImage',
                     'ecr:BatchCheckLayerAvailability',