v0.21.0

• Bumps uwsgi from 2.0.20 to 2.0.21 unlocking Python 3.10 and 3.11 support
• Bumps nginx version
• Changes from process/threads concurrency to dynamic worker concurrency with uwsgi
• Added timeouts and worker kill commands so Harvey will canabolize itself instead of the OS in the case of long running workers or too many requests
• Adds total_count to collection responses