[Snyk] Security upgrade ubuntu from latest to 22.10

[circleci-secops]

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

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

We recommend upgrading to ubuntu:22.10, as this image has only 10 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
	Out-of-bounds Write SNYK-UBUNTU2204-BASH-3098342	No Known Exploit
	Memory Leak SNYK-UBUNTU2204-LIBCAP2-5538282	No Known Exploit
	CVE-2023-2603 SNYK-UBUNTU2204-LIBCAP2-5538296	No Known Exploit
	Resource Exhaustion SNYK-UBUNTU2204-LIBZSTD-3368800	No Known Exploit
	Uncontrolled Recursion SNYK-UBUNTU2204-PCRE3-2799820	No Known Exploit

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🦉 Memory Leak 🦉 Resource Exhaustion