fix(deps): update rust crate snmalloc-rs to 0.7

Author: renovate[bot]

Cargo.lock

@@ -246,7 +246,7 @@ reqwest = { version = "0.13", features = ["blocking"], optional = true }
 mimalloc = { version = "0.1", default-features = false, optional = true }
 tcmalloc = { version = "0.3", optional = true }
 jemallocator = { version = "0.5", optional = true }
-snmalloc-rs = { version = "0.3", optional = true }
+snmalloc-rs = { version = "0.7", optional = true }
 rpmalloc = { version = "0.2", optional = true }
 
 shadowsocks-service = { version = "1.25.0", path = "./crates/shadowsocks-service", default-features = false }