Fix file:// protocol not working in Ports.fetch_project (#21456)

tools/ports/__init__.py

@@ -300,7 +300,8 @@ def retrieve():
         import requests
         response = requests.get(url)
         data = response.content
-      except ImportError:
+      except (ImportError, requests.exceptions.InvalidSchema):
+        # requests does not support 'file://' protocol and raises InvalidSchema
         from urllib.request import urlopen
         f = urlopen(url)
         data = f.read()