Update _markupbase, html/parser for CPython v3.11.2 by tdub0 · Pull Request #4703 · RustPython/RustPython

See #4564. Updated _markupbase.py and html/parser.py to match CPython v3.11.2.

Like _compression.py, there were no direct tests, but there were import references in html/parser.py and test/test_htmlparser.py. Copying from the CPython Lib: _markupbase.py, html/, test_html.py, and test_htmlparser.py showed only minor changes in _markupbase.py and html/parser.py. Thus, the tests are unchanged. test_html.py and test_htmlparser.py ran without error locally following the update.