update rocksdb

Author: liuyihua-cn

.gitmodules

@@ -4,7 +4,7 @@
 [submodule "librocksdb-sys/rocksdb"]
 	path = librocksdb-sys/rocksdb
 	url = https://github.com/haizhi-tech/rocksdb.git
-	branch = v8.1.1-hz-snapshot-fix
+	branch = v8.1.1-hz
 [submodule "librocksdb-sys/lz4"]
 	path = librocksdb-sys/lz4
 	url = https://github.com/lz4/lz4.git