fix: pip_requirements.txt to reduce vulnerabilities
fix: pip_requirements.txt to reduce vulnerabilities


The following vulnerabilities are fixed by pinning transitive dependencies:
- https://snyk.io/vuln/SNYK-PYTHON-PYGMENTS-1086606
- https://snyk.io/vuln/SNYK-PYTHON-PYGMENTS-1088505
- https://snyk.io/vuln/SNYK-PYTHON-SPHINX-570772
- https://snyk.io/vuln/SNYK-PYTHON-SPHINX-570773
timcera/tsgettoolbox,timcera/tsgettoolbox