main: Bump version string to v1.12.0

Author: Twarit Waikar

p4-fusion/main.cc

@@ -24,7 +24,7 @@
 #include "p4/p4libs.h"
 #include "minitrace.h"
 
-#define P4_FUSION_VERSION "v1.11.0"
+#define P4_FUSION_VERSION "v1.12.0"
 
 void SignalHandler(sig_atomic_t s);