[Snyk] Security upgrade mailauth from 4.6.6 to 4.6.9

[andris9]

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
	Regular Expression Denial of Service (ReDoS) SNYK-JS-FASTXMLPARSER-7573289	559

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