Removed pyhash dependency

[ActiveChooN]

Motivation and context

Switched from pyhash to default hashlib library due to avx2 instructions dependency

#Fixed #2123

How has this been tested?

Manually

Checklist

• I submit my changes into the develop branch
• I have added description of my changes into CHANGELOG file
  - [] I have updated the documentation accordingly
  - [ ] I have added tests to cover my changes
• I have linked related issues (read github docs)
  - [ ] I have increased versions of npm packages if it is necessary (cvat-canvas,
  cvat-core, cvat-data and cvat-ui)

License

• I submit my code changes under the same MIT License that covers the project.
  Feel free to contact the maintainers if that's a concern.
• I have updated the license header for each file (see an example below)

# Copyright (C) 2020 Intel Corporation
#
# SPDX-License-Identifier: MIT

[coveralls]

Coverage remained the same at 65.38% when pulling ec64067 on dk/label-name-hash into ca70941 on develop.

[nmanovic]

@ActiveChooN , great PR. Recently got a lot of troubles with pyhash. I hope we will not have and performance penalty due to the change.