Update dependency preflight to v1.15.1

| datasource      | package                                        | from   | to     |
| --------------- | ---------------------------------------------- | ------ | ------ |
| github-releases | redhat-openshift-ecosystem/openshift-preflight | 1.14.1 | 1.15.1 |


Signed-off-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

.github/workflows/release-operator.yml

@@ -192,7 +192,7 @@ jobs:
     runs-on: ubuntu-24.04-amd64
     needs: [variables, build]
     env:
-      preflight_version: 1.14.1 # renovate: datasource=github-releases depName=preflight packageName=redhat-openshift-ecosystem/openshift-preflight
+      preflight_version: 1.15.1 # renovate: datasource=github-releases depName=preflight packageName=redhat-openshift-ecosystem/openshift-preflight
       submit_results: ${{ ! inputs.dry_run && '--submit' || '' }}
     steps:
       - name: Checkout Repository