PR https://github.com/gem5/gem5/pull/396 updates the gem5 SST bridge to use StandardMem in SST. This change updates the nightly tests to use SST 13.0.0 instead of SST 11.1.0. It also updates the dockerfile. Change-Id: I5c109c40379d2f09601a1c9f19c51dd716c6582e --------- Signed-off-by: Kaustav Goswami <kggoswami@ucdavis.edu> Co-authored-by: Bobby R. Bruce <bbruce@ucdavis.edu>