chore(deps): update quay.io/redhat-appstudio/build-trusted-artifacts:latest docker digest to 260b28e

[red-hat-konflux]

This PR contains the following updates:

Package	Type	Update	Change
quay.io/redhat-appstudio/build-trusted-artifacts	tekton-step-image	digest	af3f156 -> 260b28e

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[openshift-ci]

Hi @red-hat-konflux[bot]. Thanks for your PR.

I'm waiting for a stackrox member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

Once the patch is verified, the new status will be reflected by the ok-to-test label.

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