Update tokio-prost monorepo to 0.12.4

Author: renovate[bot]

Cargo.toml

@@ -10,14 +10,14 @@ repository = "https://github.com/itsbalamurali/rust-fhir"
 license-file = "LICENSE"
 
 [dependencies]
-prost = { version = "0.11", features = ["prost-derive"] }
-prost-types = "0.11"
+prost = { version = "0.12.4", features = ["prost-derive"] }
+prost-types = "0.12.4"
 prost-wkt = "0.3.4"
 prost-wkt-types = "0.3.3"
 serde = { version = "1.0", features = ["derive"] }
 serde_json = "1.0"
 chrono = { version = "0.4", features = ["serde"] }
 
 [build-dependencies]
-prost-build = { version = "0.11" }
+prost-build = { version = "0.12.4" }
 prost-wkt-build = "0.3.4"