[Snyk] Security upgrade node-mailjet from 3.4.1 to 4.0.0

[dlminvestments]

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

Snyk changed the following file(s):

• appengine/mailjet/package.json

Vulnerabilities that will be fixed with an upgrade:

	Issue	Score
	Server-side Request Forgery (SSRF) SNYK-JS-IP-12704893	716

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• Check the changes in this PR to ensure they won't cause issues with your project.
• Max score is 1000. Note that the real score may have changed since the PR was raised.
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[github-actions]

Scan Summary

Tool	Critical	High	Medium	Low	Status
Security Audit for Infrastructure	12	54	0	56	❌
Secrets Audit	0	4	0	0	❌
Shell Script Analysis	0	0	0	0	✅

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