v0.9.0 - pyflightdata2: Cloudflare fix + community maintenance

First release under the new fork identity, taking over maintenance since supercoderz/pyflightdata has been inactive since 2021.

• Fixes Cloudflare 403 errors blocking login and data requests (curl_cffi TLS impersonation).
• Published to PyPI as pyflightdata2 (the pyflightdata import path is unchanged).
• Modernized packaging (pyproject.toml) and CI.