Packaging: bump pyyaml to 6.0; other version increments; Python 3.10 classifier. (#1229)
Packaging: bump pyyaml to 6.0; other version increments; Python 3.10 classifier. (#1229)

- Bump minimum pyyaml version to 6.0, maximum <7.0.
- Set minimum version for hidapi.
- Increment pylink-square minimum to 0.11.1.
- Add Python 3.10 to classifiers.
pyocd/pyOCD,flit/pyOCD,pyocd/pyOCD,flit/pyOCD