Bump prometheus to 0.13

Author: romanz

Cargo.lock

@@ -29,7 +29,7 @@ dirs-next = "2.0"
 env_logger = "0.7"
 log = "0.4"
 parking_lot = "0.11"
-prometheus = { version = "0.12", optional = true }
+prometheus = { version = "0.13", optional = true }
 rayon = "1.5"
 serde = "1.0"
 serde_derive = "1.0"