[Snyk] Security upgrade express from 4.20.0 to 4.21.0

[nr-security-github]

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

Snyk changed the following file(s):

• prisma-app/app/package.json

Vulnerabilities that will be fixed with an upgrade:

	Issue	Score
	Cross-site Scripting SNYK-JS-SEND-7926862	391

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