[Snyk] Security upgrade nginx from 1.19.0-alpine to 1.21-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:1.21-alpine, as this image has only 0 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
	500	Resource Exhaustion SNYK-ALPINE311-NGHTTP2-588176	No Known Exploit
	500	Integer Overflow or Wraparound SNYK-ALPINE311-OPENSSL-1075738	No Known Exploit
	500	Integer Overflow or Wraparound SNYK-ALPINE311-OPENSSL-1075738	No Known Exploit
	500	Improper Certificate Validation SNYK-ALPINE311-OPENSSL-1089242	No Known Exploit
	500	Improper Certificate Validation SNYK-ALPINE311-OPENSSL-1089242	No Known Exploit

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