build(deps): bump grafana/grafana

Bumps the base-images group in /base-images/grafana with 1 update: grafana/grafana.


Updates `grafana/grafana` from 9.5.21 to 11.6.9

---
updated-dependencies:
- dependency-name: grafana/grafana
  dependency-version: 11.6.9
  dependency-type: direct:production
  update-type: version-update:semver-major
  dependency-group: base-images
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

base-images/grafana/Dockerfile

@@ -1 +1 @@
-FROM grafana/grafana:9.5.21
+FROM grafana/grafana:11.6.9