[Snyk] Security upgrade nginx from 1.17.8 to latest

[Manhydra]

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

• Dockerfile

We recommend upgrading to nginx:latest, as this image has only 87 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
	714	Directory Traversal SNYK-DEBIAN10-DPKG-2847944	No Known Exploit
	514	Out-of-bounds Write SNYK-DEBIAN10-FREETYPE-1019582	Mature
	614	Improper Input Validation SNYK-DEBIAN10-GZIP-2444259	No Known Exploit
	514	Use of a Broken or Risky Cryptographic Algorithm SNYK-DEBIAN10-LIBGCRYPT20-1582894	No Known Exploit
	714	Out-of-bounds Read SNYK-DEBIAN10-LIBTASN16-3061094	No Known Exploit

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Learn how to fix vulnerabilities with free interactive lessons:

🦉 Directory Traversal
🦉 Use of a Broken or Risky Cryptographic Algorithm