[Snyk] Security upgrade nginx from alpine to 1.20-alpine

[snyk-bot]

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

• Dockerfile

We recommend upgrading to nginx:1.20-alpine, as this image has only 2 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
	400	Out-of-bounds Read SNYK-ALPINE315-FREETYPE-2834869	No Known Exploit
	400	Out-of-bounds Read SNYK-ALPINE315-FREETYPE-2834870	No Known Exploit
	571	Out-of-bounds Read SNYK-ALPINE315-PCRE2-2869383	No Known Exploit
	571	Out-of-bounds Read SNYK-ALPINE315-PCRE2-2869384	No Known Exploit

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