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:f57f1f1f8d455729a7e04eb41c658530d710c9febe34844e062f084c17c1a382
-generated: "2025-07-21T06:40:24.054695705Z"
+  version: 21.0.8
+digest: sha256:d028bd5d929dad0d9cf15aa1d67ea000a43dd017da66d68503e4bf94efc5aa98
+generated: "2025-07-28T08:13:03.848498057Z"

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: 21.0.8
     condition: nginx.enabled
 maintainers:
   - name: sentry-kubernetes