⬆️(project) upgrade mjml to v5 [SECURITY]

| datasource | package | from   | to    |
| ---------- | ------- | ------ | ----- |
| npm        | mjml    | 4.15.3 | 5.0.0 |

Author: renovate[bot]

src/mail/package.json

@@ -5,7 +5,7 @@
   "type": "module",
   "dependencies": {
     "@html-to/text-cli": "0.5.4",
-    "mjml": "4.15.3"
+    "mjml": "5.0.0"
   },
   "private": true,
   "scripts": {