[Snyk] Security upgrade alpine from 3.21.3 to 3.22.2

[wkrause13]

Snyk has created this PR to fix 2 vulnerabilities in the dockerfile dependencies of this project.

Keeping your Docker base image up-to-date means you’ll benefit from security fixes in the latest version of your chosen image.

Snyk changed the following file(s):

• example/proxycontroller/Dockerfile

We recommend upgrading to alpine:3.22.2, as this image has only 2 known vulnerabilities. To do this, merge this pull request, then verify your application still works as expected.

Vulnerabilities that will be fixed with an upgrade:

	Issue	Score
	CVE-2024-58251 SNYK-ALPINE321-BUSYBOX-14102399	436
	CVE-2024-58251 SNYK-ALPINE321-BUSYBOX-14102399	436
	CVE-2024-58251 SNYK-ALPINE321-BUSYBOX-14102399	436
	CVE-2025-46394 SNYK-ALPINE321-BUSYBOX-14102401	436
	CVE-2025-46394 SNYK-ALPINE321-BUSYBOX-14102401	436

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• Check the changes in this PR to ensure they won't cause issues with your project.
• Max score is 1000. Note that the real score may have changed since the PR was raised.
• This PR was automatically created by Snyk using the credentials of a real user.

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