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-LXML-1088006
ElofssonLab/web_common_backend,ElofssonLab/web_common_backend,ElofssonLab/web_common_backend,ElofssonLab/web_common_backend,ElofssonLab/web_common_backend