Update ghcr.io/cloudnative-pg/plugin-barman-cloud-sidecar Docker tag to v0.8.0 (#1875)

This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| ghcr.io/cloudnative-pg/plugin-barman-cloud-sidecar | minor | `v0.7.0` -> `v0.8.0` |

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### Configuration

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Reviewed-on: #1875
Co-authored-by: Renovate Bot <renovate-bot@alexlebens.net>
Co-committed-by: Renovate Bot <renovate-bot@alexlebens.net>

clusters/cl01tl/storage/cloudnative-pg/values.yaml

@@ -11,6 +11,6 @@ plugin-barman-cloud:
   sidecarImage:
     registry: ghcr.io
     repository: cloudnative-pg/plugin-barman-cloud-sidecar
-    tag: v0.7.0
+    tag: v0.8.0
   crds:
     create: true