[Snyk] Security upgrade nginx from stable to 1.22

[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

• grpc-beer-nginx/Dockerfile

We recommend upgrading to nginx:1.22, as this image has only 84 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
	436	CVE-2022-35252 SNYK-DEBIAN11-CURL-3012384	No Known Exploit
	400	Use After Free SNYK-DEBIAN11-LIBXSLT-2964230	No Known Exploit
	500	Out-of-bounds Read SNYK-DEBIAN11-PCRE2-2808697	No Known Exploit
	500	Out-of-bounds Read SNYK-DEBIAN11-PCRE2-2808704	No Known Exploit
	500	Out-of-bounds Write SNYK-DEBIAN11-ZLIB-2976151	No Known Exploit

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