deps/Makefile: Update titan.ProtocolModules.BSSMAP to new rebased master reference

The master branch in osmocom's gerrit repository has been rebased on top
of current upstream master, hence the commit hash changed. Update it.

Related: OS#6011
Change-Id: Ife9dba3fc98d287d71b2334453dd9ce71471ddcb
1 file changed