[release-v1.18] Update quay.io/konflux-ci/konflux-vanguard/task-rpms-signature-scan:0.2 Docker digest to b5c2ba8 (#756)

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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Signed-off-by: red-hat-konflux-kflux-prd-rh02 <190377777+red-hat-konflux-kflux-prd-rh02[bot]@users.noreply.github.com>
Co-authored-by: red-hat-konflux-kflux-prd-rh02[bot] <190377777+red-hat-konflux-kflux-prd-rh02[bot]@users.noreply.github.com>

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

.tekton/docker-build.yaml

@@ -529,7 +529,7 @@ spec:
       - name: name
         value: rpms-signature-scan
       - name: bundle
-        value: quay.io/konflux-ci/konflux-vanguard/task-rpms-signature-scan:0.2@sha256:7d1c087d7d33dd97effb3b4c9f3788e4c3138da2032040d69da6929e9a3aaceb
+        value: quay.io/konflux-ci/konflux-vanguard/task-rpms-signature-scan:0.2@sha256:b5c2ba8b26e882dd4cfd396032e00898a557be59a79151a05e60c91dfc44bc5a
       - name: kind
         value: task
       resolver: bundles