update prom version

Signed-off-by: Ping Yu <[email protected]>

Author: pingyu

Cargo.toml

@@ -43,7 +43,7 @@ futures-timer = "3.0"
 grpcio = { version = "0.10", features = [ "openssl-vendored" ], default-features = false }
 lazy_static = "1"
 log = "0.4"
-prometheus = { version = "0.12", features = [ "push", "process" ], default-features = false } 
+prometheus = { version = "0.13", features = [ "push", "process" ], default-features = false }
 rand = "0.8"
 regex = "1"
 semver = "1.0"