chore(jenkins): Update Jenkins plugins (#1529)

Author: gounthar

dockerfiles/plugins.txt

@@ -21,7 +21,7 @@ font-awesome-api:7.0.0-851.vd1feb_218a_a_63
 git-client:6.3.2
 git:5.7.0
 github-api:1.321-488.v9b_c0da_9533f8
-github-branch-source:1844.v4a_9883d49126
+github-branch-source:1848.v42f74f7f4500
 github:1.44.0
 gradle:2.16.1149.v711b_998b_0532
 instance-identity:203.v15e81a_1b_7a_38