fix: lambdas/requirements.txt to reduce vulnerabilities

The following vulnerabilities are fixed by pinning transitive dependencies:
- https://snyk.io/vuln/SNYK-PYTHON-SETUPTOOLS-9964606

Author: snyk-bot

lambdas/requirements.txt

@@ -1,2 +1,3 @@
 awscli
-kubernetes==9.0.0
+kubernetes==9.0.0
+setuptools>=78.1.1 # not directly required, pinned by Snyk to avoid a vulnerability