chore(jenkins): Update Jenkins plugins (#1007)

Author: gounthar

dockerfiles/plugins.txt

@@ -21,7 +21,7 @@ git-client:6.1.2
 git:5.7.0
 github-api:1.321-478.vc9ce627ce001
 github-branch-source:1810.v913311241fa_9
-github:1.41.0
+github:1.42.0
 gradle:2.14
 instance-identity:201.vd2a_b_5a_468a_a_6
 ionicons-api:74.v93d5eb_813d5f