fix: api endpoint if ghe is not set

Author: ricardojdsilva87

auth.py

@@ -69,7 +69,7 @@ def get_github_app_installation_token(
         str: the GitHub App token
     """
     jwt_headers = github3.apps.create_jwt_headers(gh_app_private_key_bytes, gh_app_id)
-    api_endpoint = f"{ghe}/api/v3" if ghe else "api.github.com"
+    api_endpoint = f"{ghe}/api/v3" if ghe else "https://api.github.com"
     url = f"{api_endpoint}/app/installations/{gh_app_installation_id}/access_tokens"
 
     try:

contributor_stats.py

@@ -153,10 +153,10 @@ def get_sponsor_information(contributors: list, token: str, ghe: str) -> list:
         variables = {"username": contributor.username}
 
         # Send the GraphQL request
-        api_endpoint = f"{ghe}/api/v3" if ghe else "api.github.com"
+        api_endpoint = f"{ghe}/api/v3" if ghe else "https://api.github.com"
         headers = {"Authorization": f"Bearer {token}"}
         response = requests.post(
-            f"https://{api_endpoint}/graphql",
+            f"{api_endpoint}/graphql",
             json={"query": query, "variables": variables},
             headers=headers,
             timeout=60,