[Snyk] Security upgrade nginx from latest to stable

[Weasley-J]

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

• lejing-web-frontend/Dockerfile

We recommend upgrading to nginx:stable, as this image has only 90 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	Integer Overflow or Wraparound SNYK-DEBIAN11-LIBXML2-2806812	No Known Exploit
	500	SQL Injection SNYK-DEBIAN11-OPENLDAP-2808413	No Known Exploit
	500	OS Command Injection SNYK-DEBIAN11-OPENSSL-2807596	No Known Exploit
	221	Out-of-bounds Read SNYK-DEBIAN11-TIFF-2823289	No Known Exploit
	221	Out-of-bounds Read SNYK-DEBIAN11-TIFF-2823291	No Known Exploit

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