Update version to 3.7.4 in zookeeper_version.h (C client)

zookeeper-client/zookeeper-client-c/include/zookeeper_version.h

@@ -22,7 +22,7 @@
 extern "C" {
 #endif
 
-#define ZOO_VERSION "3.7.3"
+#define ZOO_VERSION "3.7.4"
 
 #ifdef __cplusplus
 }