Bump nginx from 1.30.3-alpine-slim to 1.30.4-alpine-slim

Bumps nginx from 1.30.3-alpine-slim to 1.30.4-alpine-slim.

---
updated-dependencies:
- dependency-name: nginx
  dependency-version: 1.30.4-alpine-slim
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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Author: dependabot[bot]

Dockerfile

@@ -2,7 +2,7 @@ FROM orthanc2/pelican:pelican-4.12_python-3.14
 COPY . /work/
 RUN pelican content -o output -s publishconf.py
 
-FROM nginx:1.30.3-alpine-slim
+FROM nginx:1.30.4-alpine-slim
 LABEL maintainer="elrido@gmx.net"
 WORKDIR /srv
 COPY --from=0 /work/output/ /usr/share/nginx/html/