fix: openapi/tests/requirements.txt to reduce vulnerabilities (qdrant#2882)

The following vulnerabilities are fixed by pinning transitive dependencies:
- https://snyk.io/vuln/SNYK-PYTHON-WERKZEUG-6035177

Co-authored-by: snyk-bot <[email protected]>

Author: generall

openapi/tests/requirements.txt

@@ -1,4 +1,5 @@
 schemathesis~=3.19.5
 requests
 pytest==7.2.2
-pytest-timeout==2.1.0
+pytest-timeout==2.1.0
+werkzeug>=3.0.1 # not directly required, pinned by Snyk to avoid a vulnerability