python: Update requirements.txt for security issues

Per GitHub Dependabot:
- Use setuptools 65.5.1 to avoid some DoS issue
- Use requests 2.31.0 to avoid leaking some proxy information

Signed-off-by: Tom Rini <trini@konsulko.com>
Tested-by: Heinrich Schuchardt <xypron.glpk@gmx.de>