Update quay.io/konflux-ci/konflux-vanguard/task-rpms-signature-scan:0.2 Docker digest to 90c2b32

[red-hat-konflux-kflux-prd-rh02[bot]]

This PR contains the following updates:

Package	Type	Update	Change
quay.io/konflux-ci/konflux-vanguard/task-rpms-signature-scan	tekton-bundle	digest	13cf619 -> 90c2b32

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