chore(deps): update nginxinc/nginx-unprivileged docker tag to v1.26 (#646)

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

Author: renovate[bot]

Dockerfile-docs

@@ -17,7 +17,7 @@ RUN python theme_common/scripts/combine_mkdocs_config_yaml.py theme_common/mkdoc
 # build the docs
 RUN mkdocs build
 
-FROM nginxinc/nginx-unprivileged:1.25-alpine as deploy
+FROM nginxinc/nginx-unprivileged:1.26-alpine as deploy
 COPY --from=builder $HOME/application/site/ /usr/share/nginx/html/reloader/
 COPY docs-nginx.conf /etc/nginx/conf.d/default.conf