chore(deps): update nginx docker tag to v21

Author: renovate[bot]

charts/sentry/Chart.lock

@@ -22,6 +22,6 @@ dependencies:
   version: 12.5.1
 - name: nginx
   repository: oci://registry-1.docker.io/bitnamicharts
-  version: 18.2.5
-digest: sha256:d2d9ed95a3d4add3948dc237ba578be86e8dbee03bbee6ba7a886bc950b75ab2
-generated: "2025-09-22T01:15:11.742892877Z"
+  version: 21.1.23
+digest: sha256:b56adc969e0bfe3ab8f20c9d8a0805c1487fe1823208140f891031c7399c53c1
+generated: "2025-09-22T03:51:55.920914196Z"

charts/sentry/Chart.yaml

@@ -37,7 +37,7 @@ dependencies:
     condition: postgresql.enabled
   - name: nginx
     repository: oci://registry-1.docker.io/bitnamicharts
-    version: 18.2.5
+    version: 21.1.23
     condition: nginx.enabled
 maintainers:
   - name: sentry-kubernetes