Refactor GitHub Query Utilization for Package Versions

Change the method used to fetch GitHub GraphQL queries in github.py
Shift from vulnerabilities.utils.fetch_github_graphql_query to fetchcode.package_versions.github_response
The change avoids dependencies on Django apps in vulnerabilities.utils
Signed-off-by: PoJuDeSu <spes9850401@gmail.com>

Author: poju3185

vulntotal/datasources/github.py

@@ -13,7 +13,7 @@
 from dotenv import load_dotenv
 from packageurl import PackageURL
 
-from vulnerabilities import utils
+from fetchcode.package_versions import github_response
 from vulntotal.validator import DataSource
 from vulntotal.validator import InvalidCVEError
 from vulntotal.validator import VendorData
@@ -35,7 +35,7 @@ def fetch_github(self, graphql_query):
                 GH_TOKEN="your-github-token"
         """
         load_dotenv()
-        return utils.fetch_github_graphql_query(graphql_query)
+        return github_response(graphql_query)
 
     def datasource_advisory(self, purl) -> Iterable[VendorData]:
         end_cursor = ""