fix: samples/server/petstore/python-aiohttp-srclayout/requirements.txt to reduce vulnerabilities

The following vulnerabilities are fixed by pinning transitive dependencies:
- https://snyk.io/vuln/SNYK-PYTHON-WERKZEUG-14151620

Author: snyk-bot

samples/server/petstore/python-aiohttp-srclayout/requirements.txt

@@ -4,7 +4,7 @@ connexion[aiohttp,swagger-ui] <= 2.3.0; python_version=="3.5" or python_version=
 # connexion requires werkzeug but connexion < 2.4.0 does not install werkzeug
 # we must peg werkzeug versions below to fix connexion
 # https://github.com/zalando/connexion/pull/1044
-werkzeug == 0.16.1; python_version=="3.5" or python_version=="3.4"
+werkzeug==3.1.4; python_version=="3.5" or python_version=="3.4"
 swagger-ui-bundle == 0.0.9
 aiohttp_jinja2 == 1.5.0
 Flask < 2.3