[3.9] bpo-45097: Remove incorrect deprecation warnings in asyncio. (GH-28153)

Deprecation warnings about the loop argument were incorrectly emitted
in cases when the loop argument was used inside the asyncio library,
not from user code.

Lib/asyncio/subprocess.py

@@ -193,8 +193,8 @@ class Process:
             stderr = self._read_stream(2)
         else:
             stderr = self._noop()
-        stdin, stdout, stderr = await tasks.gather(stdin, stdout, stderr,
-                                                   loop=self._loop)
+        stdin, stdout, stderr = await tasks._gather(stdin, stdout, stderr,
+                                                    loop=self._loop)
         await self.wait()
         return (stdout, stderr)