fix(ingest): avoid git dependency in dbt (datahub-project#9447)

metadata-ingestion/src/datahub/configuration/git.py

@@ -6,7 +6,6 @@
 
 from datahub.configuration.common import ConfigModel
 from datahub.configuration.validate_field_rename import pydantic_renamed_field
-from datahub.ingestion.source.git.git_import import GitClone
 
 _GITHUB_PREFIX = "https://github.com/"
 _GITLAB_PREFIX = "https://gitlab.com/"
@@ -151,6 +150,9 @@ def clone(
     ) -> pathlib.Path:
         """Clones the repo into a temporary directory and returns the path to the checkout."""
 
+        # We import this here to avoid a hard dependency on gitpython.
+        from datahub.ingestion.source.git.git_import import GitClone
+
         assert self.repo_ssh_locator
 
         git_clone = GitClone(str(tmp_path))