Add VOLTHADevs group permissions on jobs

- bump JJB version to 4.1.0

Change-Id: I7baeaf10c9c32f3f9f0da196c65d80ffd7b0a451
diff --git a/Makefile b/Makefile
index 1071410..cd0ef9d 100644
--- a/Makefile
+++ b/Makefile
@@ -3,7 +3,7 @@
 
 SHELL = bash -e -o pipefail
 VENV_DIR      ?= venv-jjb
-JJB_VERSION   ?= 3.2.0
+JJB_VERSION   ?= 4.1.0
 JOBCONFIG_DIR ?= job-configs
 
 $(VENV_DIR):