fix: py/requirements_lock.txt to reduce vulnerabilities

The following vulnerabilities are fixed by pinning transitive dependencies:
- https://snyk.io/vuln/SNYK-PYTHON-URLLIB3-10390193
- https://snyk.io/vuln/SNYK-PYTHON-URLLIB3-10390194

Author: snyk-bot

py/requirements_lock.txt

@@ -315,7 +315,7 @@ trio==0.20.0 \
     #   -r py/requirements.txt
     #   pytest-trio
     #   trio-websocket
-urllib3[socks]==1.26.9 \
+urllib3==2.5.0 \
     --hash=sha256:44ece4d53fb1706f667c9bd1c648f5469a2ec925fcf3a776667042d645472c14 \
     --hash=sha256:aabaf16477806a5e1dd19aa41f8c2b7950dd3c746362d7e3223dbe6de6ac448e
     # via -r py/requirements.txt