[Snyk] Security upgrade express from 4.19.2 to 4.20.0

[jfederico]

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-PATHTOREGEXP-7925106	738

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[github-actions]

Updated Docker image pushed to docker.io/bigbluebutton/bbb-webhooks:pr-54