Update ncclient to 0.6.16

requirements.txt

@@ -3,7 +3,7 @@ jinja2==3.1.2
 jmespath~=1.0.1
 junos-eznc~=2.7.0
 jxmlease~=1.0.3
-ncclient~=0.6.15
+ncclient~=0.6.16
 netaddr~=0.8.0
 requests~=2.31.0
 ruamel.yaml~=0.18.5