chore(deps): update clickhouse/clickhouse-server docker tag to v26.2.1 (#4294)

This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| clickhouse/clickhouse-server | minor | `26.1.3` → `26.2.1` |

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### Configuration

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Reviewed-on: #4294
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clusters/cl01tl/helm/rybbit/values.yaml

@@ -122,7 +122,7 @@ rybbit:
         main:
           image:
             repository: clickhouse/clickhouse-server
-            tag: 26.1.3
+            tag: 26.2.1
             pullPolicy: IfNotPresent
           env:
             - name: CLICKHOUSE_DB