replace wrong return type with the correct one

Signed-off-by: Tushar Goel <tushar.goel.dav@gmail.com>

Author: TG1999

vulnerabilities/importers/alpine_linux.py

@@ -65,7 +65,7 @@ def fetch_advisory_links():
     return advisory_links
 
 
-def process_link(link) -> Iterable[Iterable[AdvisoryData]]:
+def process_link(link) -> List[AdvisoryData]:
     json_response = requests.get(link).content
     record = json.loads(json_response)
     advisories: List[AdvisoryData] = []