Update docker.io/nginxinc/nginx-unprivileged Docker tag to v1.29 (#246)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

Dockerfile

@@ -19,7 +19,7 @@ COPY --from=builder /src/public /
 
 RUN wkhtmltopdf --outline-depth 4 --enable-internal-links --enable-local-file-access  ./pdf/index.html /pdf.pdf
 
-FROM docker.io/nginxinc/nginx-unprivileged:1.28-alpine
+FROM docker.io/nginxinc/nginx-unprivileged:1.29-alpine
 
 LABEL maintainer="Puzzle ITC <https://www.puzzle.ch/>"
 LABEL org.opencontainers.image.authors="Puzzle ITC <https://www.puzzle.ch/>"