fix: server/requirements.txt to reduce vulnerabilities
fix: server/requirements.txt to reduce vulnerabilities


The following vulnerabilities are fixed by pinning transitive dependencies:
- https://snyk.io/vuln/SNYK-PYTHON-PILLOW-1080635
- https://snyk.io/vuln/SNYK-PYTHON-PILLOW-1080654
- https://snyk.io/vuln/SNYK-PYTHON-PILLOW-1081494
- https://snyk.io/vuln/SNYK-PYTHON-PILLOW-1081501
- https://snyk.io/vuln/SNYK-PYTHON-PILLOW-1081502
- https://snyk.io/vuln/SNYK-PYTHON-PILLOW-1082329
- https://snyk.io/vuln/SNYK-PYTHON-PILLOW-1082750
BrianLusina/Arco,BrianLusina/Arco,BrianLusina/Arco,BrianLusina/Arco