CI, packaging metadata, and docs now reflect Python 3.11 as the minimum
supported version. Also collapses the sys.version_info compat shims in
superset/app.py, superset/middleware/legacy_prefix_redirect.py, and
superset/utils/backports.py, which existed solely to support running on
Python 3.10 (StrEnum and wsgiref.types were both added in 3.11).
Removing the 3.10 floor also drops the now-dead pyhive<0.7.0 marker for
python_version<'3.11' and obsoletes the need to pin syntaqlite below
0.5.0 for 3.10 compatibility.
Closes#42007
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
