Prepare for release (#1198)

Author: JulianGCalderon

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "cairo-native"
-version = "0.5.0-rc.3"
+version = "0.5.0-rc.4"
 edition = "2021"
 license = "Apache-2.0"
 description = "A compiler to convert Cairo's IR Sierra code to MLIR and execute it."

README.md

@@ -41,7 +41,7 @@ often so use it at your own risk. 🚧
 
 For versions under `1.0` `cargo` doesn't comply with
 [semver](https://semver.org/), so we advise to pin the version you
-use. This can be done by adding `cairo-native = "0.5.0-rc.3"` to your Cargo.toml
+use. This can be done by adding `cairo-native = "0.5.0-rc.4"` to your Cargo.toml
 
 ## Getting Started