[release-v1.19] Update quay.io/konflux-ci/konflux-vanguard/task-rpms-signature-scan:0.2 Docker digest to b5c2ba8

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

This PR contains the following updates:

Package	Type	Update	Change
quay.io/konflux-ci/konflux-vanguard/task-rpms-signature-scan	tekton-bundle	digest	7d1c087 -> b5c2ba8

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[openshift-ci]

Hi @red-hat-konflux-kflux-prd-rh02[bot]. Thanks for your PR.

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[creydr]

/retest
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[openshift-ci]

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