chore(deps): update container image chronograf to latest@780d6e8 by renovate (#25940)

This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| chronograf | digest | `7501ef4` -> `780d6e8` |

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charts/stable/chronograf/Chart.yaml

@@ -33,4 +33,4 @@ sources:
   - https://hub.docker.com/_/chronograf
   - https://www.influxdata.com/time-series-platform/chronograf/
 type: application
-version: 7.1.7
+version: 7.1.8

charts/stable/chronograf/values.yaml

@@ -1,7 +1,7 @@
 image:
   pullPolicy: IfNotPresent
   repository: chronograf
-  tag: latest@sha256:7501ef406fe9cb5edd43c702abe4de2a399ada7af5db4930c2966b8389eba7d9
+  tag: latest@sha256:780d6e8d427894fa2e51dd7c6aa734ac30242b3597669419b03a221920a1be7a
 persistence:
   chronograf:
     enabled: true