upgrade to latest parallel-hashmap and pybind11

[virtualluke]

Any chance these packages can get updated to newer versions?

[atom-moyer]

Definitely possible. Are you familiar if the binary files that the hashmap saves will be valid after the update? That is my only concern.

[JunXu01]

Do we have the plan to update getpy to 0.15.1 on pip, the current 'S16' is too short. The latest getpy version on pip is still 0.14.2.