Upgrade to llhttp 9.2 (aio-libs#8146) (aio-libs#8152)

(cherry picked from commit 0ec65c0)

Author: Dreamsorcerer

CHANGES/8146.feature.rst

@@ -0,0 +1 @@
+Upgraded *llhttp* to 9.2 -- by :user:`Dreamsorcerer`.

tests/test_http_parser.py

@@ -629,8 +629,6 @@ def test_invalid_header_spacing(parser, pad1: bytes, pad2: bytes, hdr: bytes) ->
 
 
 def test_empty_header_name(parser) -> None:
-    if not isinstance(response, HttpResponseParserPy):
-        pytest.xfail("Regression test for Py parser. May match C behaviour later.")
     text = b"GET /test HTTP/1.1\r\n" b":test\r\n\r\n"
     with pytest.raises(http_exceptions.BadHttpMessage):
         parser.feed_data(text)