Gdbgui

- Update default python version to 3.12
- utf-8 decode error bugfix
- fix registers cannot be displayed bug

- Compatibility with Werkzeug 2.1. Use the eventlet server instead of
the Werkzeug development server.
- Use pinned requirements instead of abstract requirements to ensure reproducability of pip installs

This release has no changes to features or usability. The only change is to include a file used by other package maintainers.

- Include all files needed to rebuild from source (403)

This release is focused mostly on Python 3.9 compatibility and updating dependencies

- Support only Python 3.9 (though other Python versions may still work)
- Build gdbgui as a [pex](https://pypi.org/project/pex/) executable.
- These are executable Python environments that are self-contained with the exception of requiring a specific Python version installed in the environment running the executable. The pex executables should have better compatibility than PyInstaller executables, which sometimes have missing shared libraries depending on the operating system.
- Use only the threading async model for flask-socketio. No longer support gevent or eventlet.
- [bugfix] Catch exception if gdb used in tty window crashes instead of gdbgui crashing along with it
- Disable pagination in gdb tty by default. It can be turned back on with `set pagination off`.
- Upgrade various dependencies for both the backend and frontend (Python and JavaScript)
- Display gdbgui version in "about" and "session information"

- Pinned python-socketio version
- Pinned mypy version to unbreak linting
- Fixed reverse debugging commands that were broken when `--gdb` flag was removed

- Fix import paths
- Pin broken dependency to avoid segfault
- Hide "No registers." message