Update Ubuntu18.04 builder node

Update to a newer image to fetch changes by
I8b2c84eafdf8fe17866a2272665ff9396a84e432
(Added Python 3.8 env support)

Issue-ID: CIMAN-33
Signed-off-by: Jessica Wagantall <jwagantall@linuxfoundation.org>
Change-Id: Ic2f3b4711c15f928a9f958498cef81b65d4f2e43
1 file changed