Update quay.io/prometheus/node-exporter Docker tag to v1.9.1

| datasource | package                          | from   | to     |
| ---------- | -------------------------------- | ------ | ------ |
| docker     | quay.io/prometheus/node-exporter | v1.9.0 | v1.9.1 |

Author: renovate[bot]

kubernetes/namespaces/monitoring/node_exporter/daemonset.yaml

@@ -40,7 +40,7 @@ spec:
       hostPID: true
       containers:
       - name: node-exporter
-        image: quay.io/prometheus/node-exporter:v1.9.0
+        image: quay.io/prometheus/node-exporter:v1.9.1
         args:
           - --path.procfs=/host/proc
           - --path.sysfs=/host/sys