Update nginx Docker tag to v1.27.3

| datasource | package | from   | to     |
| ---------- | ------- | ------ | ------ |
| docker     | nginx   | 1.27.2 | 1.27.3 |


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build/Dockerfile.nginx

@@ -1,5 +1,5 @@
 # syntax=docker/dockerfile:1.12
-FROM nginx:1.27.2-alpine-otel
+FROM nginx:1.27.3-alpine-otel
 
 ARG NJS_DIR
 ARG NGINX_CONF_DIR