[prometheus-nginx-exporter] Update Helm release nginx to v21.0.9 (#5991)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

charts/prometheus-nginx-exporter/Chart.lock

@@ -1,6 +1,6 @@
 dependencies:
 - name: nginx
   repository: https://charts.bitnami.com/bitnami
-  version: 21.0.8
-digest: sha256:bc15236344f8a8f0636490d0d6942509d4ad69a61224eb660cd106de4852793c
-generated: "2025-07-18T03:36:24.871448025Z"
+  version: 21.0.9
+digest: sha256:ad6fa532061417985ab2c0453196ac70d4cd6c2d4770a91f602c0188a29d9b52
+generated: "2025-07-31T22:04:35.600794517Z"

charts/prometheus-nginx-exporter/Chart.yaml

@@ -2,7 +2,7 @@
 apiVersion: v2
 description: A Helm chart for NGINX Prometheus Exporter
 name: prometheus-nginx-exporter
-version: 1.10.2
+version: 1.10.3
 # renovate: github-releases=nginx/nginx-prometheus-exporter
 appVersion: 1.4.2
 home: https://github.com/nginxinc/nginx-prometheus-exporter
@@ -33,6 +33,6 @@ annotations:
 type: application
 dependencies:
   - name: nginx
-    version: "21.0.8"
+    version: "21.0.9"
     repository: https://charts.bitnami.com/bitnami
     condition: nginx.enabled