chore(jenkins): Update Jenkins plugins

Author: gounthar

dockerfiles/plugins.txt

@@ -62,7 +62,7 @@ scm-api:698.v8e3b_c788f0a_6
 script-security:1369.v9b_98a_4e95b_2d
 snakeyaml-api:2.3-123.v13484c65210a_
 ssh-credentials:349.vb_8b_6b_9709f5b_
-ssh-slaves:2.1010.v64ec48721231
+ssh-slaves:3.1021.va_cc11b_de26a_e
 sshd:3.330.vc866a_8389b_58
 structs:338.v848422169819
 timestamper:1.28