[Snyk] Security upgrade nodemailer from 6.7.2 to 7.0.7

[ASWINRM]

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

Snyk changed the following file(s):

• backend/package.json
• backend/package-lock.json

Vulnerabilities that will be fixed with an upgrade:

	Issue	Score
	Interpretation Conflict SNYK-JS-NODEMAILER-13378253	738

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