Bump build base version to v1.22.6b1

[github-actions]

Update build base version

Bump to latest build base version in Dockerfile

changed lines [1] of file "/tmp/updatecli/github/rancher/image-build-cluster-proportional-autoscaler/Dockerfile"

v1.22.5b1

Release published on the 2024-07-16 16:25:37 +0000 UTC at the url https://github.com/rancher/image-build-base/releases/tag/v1.22.5b1

v1.22.6b1

Release published on the 2024-08-12 20:30:49 +0000 UTC at the url https://github.com/rancher/image-build-base/releases/tag/v1.22.6b1

* v1.22.6b1

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