fix: requirements-dev.txt to reduce vulnerabilities (#140)

The following vulnerabilities are fixed by pinning transitive dependencies:
- https://snyk.io/vuln/SNYK-PYTHON-IDNA-6597975

Co-authored-by: snyk-bot <snyk-bot@snyk.io>

Author: uc-snyk

requirements-dev.txt

@@ -14,7 +14,7 @@ click==8.1.6
     # via pip-tools
 coverage[toml]==7.2.7
     # via pytest-cov
-idna==3.4
+idna==3.7
     # via requests
 iniconfig==2.0.0
     # via pytest