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


The following vulnerabilities are fixed by pinning transitive dependencies:
- https://snyk.io/vuln/SNYK-PYTHON-WTFORMS-40581
ohaz/amos-ss15-proj1,ohaz/amos-ss15-proj1,ohaz/amos-ss15-proj1,ohaz/amos-ss15-proj1,ohaz/amos-ss15-proj1,ohaz/amos-ss15-proj1,ohaz/amos-ss15-proj1,ohaz/amos-ss15-proj1