[Snyk] Security upgrade nginx from 1.25.3-alpine to 1.25.4-alpine (#19)

fix: buildtools/Dockerfile.nginx to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-ALPINE318-EXPAT-6241039
- https://snyk.io/vuln/SNYK-ALPINE318-EXPAT-6241040
- https://snyk.io/vuln/SNYK-ALPINE318-LIBXML2-6245694

Co-authored-by: snyk-bot <snyk-bot@snyk.io>

buildtools/Dockerfile.nginx

@@ -1,5 +1,5 @@
 # Create nginx container for arlo.fail
-FROM nginx:1.25.3-alpine
+FROM nginx:1.25.4-alpine
 
 RUN apk -U upgrade && rm -rf /var/cache/apk/*