benchmarks/py-asv: update to 0.6.5
Changelog: https://github.com/airspeed-velocity/asv/releases/tag/v0.6.5
https://github.com/airspeed-velocity/asv/releases/tag/v0.6.4 https://github.com/airspeed-velocity/asv/releases/tag/v0.6.3 https://github.com/airspeed-velocity/asv/releases/tag/v0.6.2