chore(jenkins): Update Jenkins plugins (#936)

Author: gounthar

dockerfiles/plugins.txt

@@ -77,6 +77,6 @@ workflow-durable-task-step:1400.v7a_fd50a_091de
 workflow-job:1498.v33a_0c6f3a_4b_4
 workflow-multibranch:795.ve0cb_1f45ca_9a_
 workflow-scm-step:427.v4ca_6512e7df1
-workflow-step-api:678.v3ee58b_469476
-workflow-support:943.v8b_0d01a_7b_a_08
+workflow-step-api:683.va_885a_76415f9
+workflow-support:944.v5a_859593b_98a_
 ws-cleanup:0.48