[Snyk] Upgrade mjml from 5.0.0 to 5.4.0

[qbey]

Snyk has created this PR to upgrade mjml from 5.0.0 to 5.4.0.

ℹ️ Keep your dependencies up-to-date. This makes it easier to fix existing vulnerabilities and to more quickly identify and fix newly disclosed vulnerabilities when they affect your project.

---

• The recommended version is 10 versions ahead of your current version.

• The recommended version was released a month ago.

Issues fixed by the recommended upgrade:

	Issue	Score	Exploit Maturity
	Regular Expression Denial of Service (ReDoS) SNYK-JS-PICOMATCH-15765511	435	No Known Exploit
	Prototype Pollution SNYK-JS-PICOMATCH-15765513	435	No Known Exploit

Breaking Change Risk

Notice: This assessment is enhanced by AI.

---

Important

• Check the changes in this PR to ensure they won't cause issues with your project.
• This PR was automatically created by Snyk using the credentials of a real user.
• Max score is 1000. Note that the real score may have changed since the PR was raised.

---

Note: You are seeing this because you or someone else with access to this repository has authorized Snyk to open upgrade PRs.

For more information:

• 🧐 View latest project report
• 📜 Customise PR templates
• 🛠 Adjust upgrade PR settings
• 🔕 Ignore this dependency or unsubscribe from future upgrade PRs

[qbey]

This upgrade from mjml 5.0.0 to 5.4.0 contains a security-driven breaking change and changes to the output formatting.

Breaking Change: mj-include is now opt-in
To address a security vulnerability (GHSA-45h5-66jx-r2wf), version 5.1.0 changed the default behavior of <mj-include>. It is now disabled by default.

Recommendation: If you use <mj-include>, you must now explicitly enable it in your configuration. This is a necessary action to prevent your builds from failing or producing incorrect output.

Behavioral Change: Output Formatting

• v5.1.0: The HTML beautification engine was changed to Biome.
• v5.2.0: The engine was reverted back to js-beautify to address performance and stability issues introduced in the previous change.

These changes may cause variations in the generated HTML output. It is recommended to review the rendered output to ensure it has not negatively impacted your emails.

Notice 🤖: This content was augmented using artificial intelligence. AI-generated content may contain errors and should be reviewed for accuracy before use.

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud