[Snyk] Security upgrade nginx from latest to 1-bullseye

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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

• nginx/dockerfile

We recommend upgrading to nginx:1-bullseye, as this image has only 91 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	Cleartext Transmission of Sensitive Information SNYK-DEBIAN11-CURL-3320493	No Known Exploit
	500	Cleartext Transmission of Sensitive Information SNYK-DEBIAN11-CURL-3320493	No Known Exploit
	400	Out-of-bounds Write SNYK-DEBIAN11-NCURSES-5421197	No Known Exploit
	400	Out-of-bounds Write SNYK-DEBIAN11-NCURSES-5421197	No Known Exploit
	400	Out-of-bounds Write SNYK-DEBIAN11-NCURSES-5421197	No Known Exploit

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