chore: update version to 0.3.19 in cargo.toml files

- update the version from "0.3.18" to "0.3.19" in the `cargo.toml` file within `mithril-common` folder.

Author: falcucci

Cargo.lock

@@ -1,6 +1,6 @@
 [package]
 name = "mithril-common"
-version = "0.3.18"
+version = "0.3.19"
 description = "Common types, interfaces, and utilities for Mithril nodes."
 authors = { workspace = true }
 edition = { workspace = true }