[Snyk] Security upgrade ubuntu from latest to 22.10

[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

• docs/examples/apt-cacher-ng.Dockerfile

We recommend upgrading to ubuntu:22.10, as this image has only 7 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	Issue	Exploit Maturity
	Improper Certificate Validation SNYK-UBUNTU2204-OPENSSL-5296052	No Known Exploit
	Improper Certificate Validation SNYK-UBUNTU2204-OPENSSL-5296082	No Known Exploit
	CVE-2023-29383 SNYK-UBUNTU2204-SHADOW-5425688	No Known Exploit
	CVE-2023-29383 SNYK-UBUNTU2204-SHADOW-5425688	No Known Exploit
	Out-of-bounds Read SNYK-UBUNTU2204-TAR-3261138	No Known Exploit

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