feat: update keptn helm chart

Signed-off-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>

Author: thschue

charts/keptn/Chart.lock

@@ -9,4 +9,4 @@ dependencies:
   repository: https://charts.lifecycle.keptn.sh
   version: 0.5.0
 digest: sha256:a61c67ee32987501fa0e4847caf01f9d0f5b9acb25249c9dc799e8627570511e
-generated: "2025-03-19T12:42:08.337018002Z"
+generated: "2025-08-06T15:18:38.211727372Z"