bpo-35352: Cleanup test_asyncio/utils.py (GH-10831)

'here' variable is no longer needed.

Lib/test/test_asyncio/utils.py

@@ -156,14 +156,8 @@ class SSLWSGIServerMixin:
         # contains the ssl key and certificate files) differs
         # between the stdlib and stand-alone asyncio.
         # Prefer our own if we can find it.
-        here = os.path.join(os.path.dirname(__file__), '..', 'tests')
-        if not os.path.isdir(here):
-            here = os.path.join(os.path.dirname(os.__file__),
-                                'test', 'test_asyncio')
-        keyfile = os.path.join(here, ONLYKEY)
-        certfile = os.path.join(here, ONLYCERT)
         context = ssl.SSLContext()
-        context.load_cert_chain(certfile, keyfile)
+        context.load_cert_chain(ONLYCERT, ONLYKEY)
 
         ssock = context.wrap_socket(request, server_side=True)
         try: