chore: upgrade python testing deps to match Lambda runtime

Author: hearde

deployment/testing_requirements.txt

@@ -10,4 +10,4 @@ jmespath==0.10.0
 python-dateutil==2.8.2
 s3transfer==0.5.2
 six==1.16.0
-urllib3==1.26.9
+urllib3==1.26.11