chore(deps): bump mjml in /packages/cozy-notifications

Bumps [mjml](https://github.com/mjmlio/mjml/tree/HEAD/packages/mjml) from 4.3.1 to 4.6.3.
- [Release notes](https://github.com/mjmlio/mjml/releases)
- [Commits](https://github.com/mjmlio/mjml/commits/v4.6.3/packages/mjml)

---
updated-dependencies:
- dependency-name: mjml
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

packages/cozy-notifications/package.json

@@ -24,7 +24,7 @@
     "handlebars": "^4.1.2",
     "handlebars-layouts": "^3.1.4",
     "lodash": "^4.17.19",
-    "mjml": "4.3.1",
+    "mjml": "4.6.3",
     "word-wrap": "^1.2.3"
   },
   "peerDependencies": {
@@ -35,7 +35,7 @@
     "@babel/core": "7.16.12",
     "babel-jest": "26.6.3",
     "babel-plugin-inline-import": "3.0.0",
-    "mjml": "4.3.1"
+    "mjml": "4.6.3"
   },
   "jest": {
     "testPathIgnorePatterns": [