Update grafana/grafana Docker tag to v12.1.0 (#1479)

This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| [grafana/grafana](https://redirect.github.com/grafana/grafana) | minor
| `12.0.2` -> `12.1.0` |

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### Release Notes

<details>
<summary>grafana/grafana (grafana/grafana)</summary>

###
[`v12.1.0`](https://redirect.github.com/grafana/grafana/compare/v12.0.3...v12.1.0)

[Compare
Source](https://redirect.github.com/grafana/grafana/compare/v12.0.3...v12.1.0)

###
[`v12.0.3`](https://redirect.github.com/grafana/grafana/compare/v12.0.2...v12.0.3)

[Compare
Source](https://redirect.github.com/grafana/grafana/compare/v12.0.2...v12.0.3)

</details>

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examples/example-exemplars-tail-sampling/docker-compose.yaml

@@ -59,7 +59,7 @@ services:
     command:
       - --config.file=/config.yaml
   grafana:
-    image: grafana/grafana:12.0.2@sha256:b5b59bfc7561634c2d7b136c4543d702ebcc94a3da477f21ff26f89ffd4214fa
+    image: grafana/grafana:12.1.0@sha256:6ac590e7cabc2fbe8d7b8fc1ce9c9f0582177b334e0df9c927ebd9670469440f
     network_mode: host
     ports:
       - "3000:3000"

examples/example-native-histogram/docker-compose.yaml

@@ -18,7 +18,7 @@ services:
       - --enable-feature=native-histograms
       - --config.file=/prometheus.yml
   grafana:
-    image: grafana/grafana:12.0.2@sha256:b5b59bfc7561634c2d7b136c4543d702ebcc94a3da477f21ff26f89ffd4214fa
+    image: grafana/grafana:12.1.0@sha256:6ac590e7cabc2fbe8d7b8fc1ce9c9f0582177b334e0df9c927ebd9670469440f
     network_mode: host
     volumes:
       - ./docker-compose/grafana-datasources.yaml:/etc/grafana/provisioning/datasources/grafana-datasources.yaml