Fixes #2526: Bump paramiko and pycryptodome requirements due to vulnerability

requirements.txt

@@ -14,10 +14,10 @@ Markdown==2.6.11
 natsort==5.3.3
 ncclient==0.6.0
 netaddr==0.7.19
-paramiko==2.4.1
+paramiko==2.4.2
 Pillow==5.2.0
 psycopg2-binary==2.7.5
 py-gfm==0.1.3
-pycryptodome==3.6.4
+pycryptodome==3.6.6
 xmltodict==0.11.0