chore(deps): update kiwigrid/k8s-sidecar docker tag to v1.29.0 (#15687)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>
Co-authored-by: Paul Rogers <paul.rogers@grafana.com>
Co-authored-by: Paul Rogers <129207811+paul1r@users.noreply.github.com>

docs/sources/setup/install/helm/reference.md

@@ -10799,7 +10799,7 @@ false
 			<td>string</td>
 			<td>Docker image tag</td>
 			<td><pre lang="json">
-"1.28.0"
+"1.29.0"
 </pre>
 </td>
 		</tr>

production/helm/loki/values.yaml

@@ -3430,7 +3430,7 @@ sidecar:
     # -- The Docker registry and image for the k8s sidecar
     repository: kiwigrid/k8s-sidecar
     # -- Docker image tag
-    tag: 1.28.0
+    tag: 1.29.0
     # -- Docker image sha. If empty, no sha will be used
     sha: ""
     # -- Docker image pull policy