Update titan.ProtocolModules.GTP_v13.5.0 to current master

Current master contains a fix for missing mandatory field in MM Context IE.

Change-Id: I36c87ed98c752a54650e4453ccdff45463d0bc96
diff --git a/deps/Makefile b/deps/Makefile
index c6031cb..11ff460 100644
--- a/deps/Makefile
+++ b/deps/Makefile
@@ -92,7 +92,7 @@
 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
+titan.ProtocolModules.GTP_v13.5.0_commit=	6b769f985eb91bf5a4332f29faa4a043b23ce62e
 titan.ProtocolModules.GTPv2_v13.7.0_commit=	R.2.A-5-g85cb124
 titan.ProtocolModules.ICMP_commit=		e49d9fb9f7de637b4bf4803dc6b6e911a8661640
 titan.ProtocolModules.ICMPv6_commit=		46f4d9b6e1e3c794294a92588401a81e4881dd27