Bump nginx from 1.29.3-alpine to 1.29.4-alpine

Bumps nginx from 1.29.3-alpine to 1.29.4-alpine.

---
updated-dependencies:
- dependency-name: nginx
  dependency-version: 1.29.4-alpine
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

Dockerfile

@@ -4,7 +4,7 @@ RUN cd /shlink-api-spec && \
     npm ci && \
     npm run build
 
-FROM nginx:1.29.3-alpine
+FROM nginx:1.29.4-alpine
 LABEL maintainer="Alejandro Celaya <[email protected]>"
 RUN rm -r /usr/share/nginx/html && rm /etc/nginx/conf.d/default.conf
 COPY config/docker/nginx.conf /etc/nginx/conf.d/default.conf