Makefile: Update titan.ProtocolModules.BSSMAP to new osmocom/master branch

The repository branches were rebased and rearranged, where now its master branch
follows upstream, and we keep an osmocom/master branch with our own
patches (Osmux, not aimed at upstream) which can then be rebased on top of master.

Related: OS#6011
Change-Id: I1ec7cb6f8fa5acaca6eb434ea9449119de078c94
diff --git a/deps/Makefile b/deps/Makefile
index bd6ce8a..c6031cb 100644
--- a/deps/Makefile
+++ b/deps/Makefile
@@ -89,7 +89,7 @@
 titan.ProtocolEmulations.SCCP_commit=	 	f8a44f2cdef44d0c3adf787ab3184c293a9a58be
 titan.ProtocolModules.BSSAPP_v7.3.0_commit=	R.2.A-4-g20cfaf8
 titan.ProtocolModules.BSSGP_v13.0.0_commit=	e97d92a8b66bec399babea52f593771b76cb175a
-titan.ProtocolModules.BSSMAP_commit=		814c5d786ab633bce384eea99685f0e49a386172
+titan.ProtocolModules.BSSMAP_commit=		4acb6ab5f058477f0b90c2da182d52054e3614b0
 titan.ProtocolModules.DNS_commit=		R.7.B
 titan.ProtocolModules.GRE_commit=		R.2.A-5-g654c446
 titan.ProtocolModules.GTP_v13.5.0_commit=	54219599037626c675610d3a44433d01af264fbb