[Snyk] Security upgrade node from 12.20.1-slim to 12.22.5-slim

[MarcelRaschke]

This PR was automatically created by Snyk using the credentials of a real user.

Keeping your Docker base image up-to-date means you’ll benefit from security fixes in the latest version of your chosen image.

Changes included in this PR

• server/routerlicious/Dockerfile

We recommend upgrading to node:12.22.5-slim, as this image has only 95 known vulnerabilities. To do this, merge this pull request, then verify your application still works as expected.

Some of the most important vulnerabilities in your base image include:

Severity	Priority Score / 1000	Issue	Exploit Maturity
	514	Use of a Broken or Risky Cryptographic Algorithm SNYK-DEBIAN9-LIBGCRYPT20-1582895	No Known Exploit
	500	Out-of-bounds Write SNYK-DEBIAN9-LZ4-1277599	No Known Exploit
	500	Out-of-Bounds SNYK-DEBIAN9-SHADOW-306269	No Known Exploit
	500	Out-of-Bounds SNYK-DEBIAN9-SHADOW-306269	No Known Exploit
	514	Loop with Unreachable Exit Condition ('Infinite Loop') SNYK-DEBIAN9-TAR-312293	No Known Exploit

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