Upstream PyYAML / cython install errors

[bdowne01]

Pip requirements of PyYAML 5.4 are causing cython_sources error per this bug in their repo when running install.sh for chiadog.

Will issue a simple PR to update requirements.txt. Tested & fixes the issue.

Environment:

• OS: Ubuntu 22.04
• Python version: 3.10.12
• PIP version: 23.2.1
• Chia version: 1.8.2
• Chiadog version: latest
• Harvester: local