Bump mrml from 3.1.5 to 4.0.0 in /native/mjml_nif

Version 4.0.0 fixes a bug if you use phoenix function components
to generate MJML and have heex annotations enabled by default.

Essentially the heex annotations add comments outside the <mjml> tag
and this was breaking the pareser.  The bug has been fixed upstream.

See jdrouet/mrml#409 for more info.

CHANGELOG.md

@@ -10,6 +10,10 @@ I.e. `mjml_nif 0.x` versions use mrml versions `>= 0.1, < 1.0.0`, and `mjml_nif
 
 ## [Unreleased]
 
+## [4.0.0] - 2024-06-18
+
+- Use [mrml] v4.0.0 which fixes a bug when using HEEx annotations and phoenix function components to generate MJML (see [mrml diff v3.1.5..v4.0.0][mrml-v3.1.5-v4.0.0])
+
 ## [3.1.0] - 2024-04-18
 
 - Use [mrml] v3.1.5 (see [mrml diff v3.0.4..v3.1.5][mrml-v3.0.4-v3.1.5])

mix.exs

@@ -2,7 +2,7 @@ defmodule Mjml.MixProject do
   use Mix.Project
 
   @source_url "https://github.com/adoptoposs/mjml_nif"
-  @version "3.1.0"
+  @version "4.0.0"
 
   def project do
     [

native/mjml_nif/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "mjml_nif"
-version = "3.1.0"
+version = "4.0.0"
 authors = ["Paul Götze"]
 edition = "2021"
 
@@ -11,7 +11,10 @@ crate-type = ["cdylib"]
 
 [dependencies]
 rustler = "0.33.0"
-mrml = { version = "3.1", default-features = false, features = ["parse", "render", "orderedmap"] }
+mrml = { version = "4.0", default-features = false, features = [
+    "parse",
+    "render",
+] }
 
 [features]
 default = ["nif_version_2_15"]