[Snyk] Security upgrade mjml from 4.8.1 to 4.9.0

[g1st]

Snyk has created this PR to fix 1 vulnerabilities in the npm dependencies of this project.

Snyk changed the following file(s):

• package.json
• package-lock.json

Vulnerabilities that will be fixed with an upgrade:

	Issue	Score
	Directory Traversal SNYK-JS-MJMLCORE-14417285	631

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