QtPy 1.11.3 on Python PyPI

What's Changed

PR: Catch PythonQtError when trying to do alias for QtDataVisualization and dev version correction by @dalthviz in #281
PR: Add a warning for developers still running legacy Qt4-based APIs by @CAM-Gerlach in #283
PR: Import Callable and MutableMapping in py3compat for Python 2 compat by @davvid in #285
PR: Add warning for deprecated/EoL Qt5 & PyQt5/PySide2 versions to fix #284 by @CAM-Gerlach in #289
PR: Update RELEASE.md for 1.x version by @dalthviz in #293

Full commits list between this release and the previous one: v1.11.2...v1.11.3

Full Changelog: CHANGELOG.md - Version 1.11.3 (2021-12-03)