refactor: standardize import statements in GitHub trigger files

- Removed redundant import paths for `fetch_repositories` in `github.py` and `issue_comment.py`.
- Updated import statements to use a consistent module path for better maintainability.

These changes enhance code organization and readability across the GitHub trigger implementation.

python/examples/github_trigger/provider/github.py

@@ -8,6 +8,7 @@ from collections.abc import Mapping
 from typing import Any
 
 import requests
+from utils.dynamic_options import fetch_repositories
 from werkzeug import Request, Response
 
 from dify_plugin.entities import I18nObject, ParameterOption
@@ -21,7 +22,6 @@ from dify_plugin.errors.trigger import (
     TriggerValidationError,
 )
 from dify_plugin.interfaces.trigger import TriggerProvider
-from examples.github_trigger.utils.dynamic_options import fetch_repositories
 
 
 class GithubProvider(TriggerProvider):

python/examples/github_trigger/triggers/issue_comment.py

@@ -1,12 +1,12 @@
 from collections.abc import Mapping
 from typing import Any
 
+from utils.dynamic_options import fetch_repositories
 from werkzeug import Request
 
 from dify_plugin.entities import ParameterOption
 from dify_plugin.entities.trigger import Event
 from dify_plugin.interfaces.trigger import TriggerEvent
-from examples.github_trigger.utils.dynamic_options import fetch_repositories
 
 
 class IssueCommentTrigger(TriggerEvent):