Update nginx to v1.17.4 (#5154)

frameworks/PHP/php-ngx/php-ngx-async.dockerfile

@@ -11,7 +11,7 @@ RUN apt-get update -yqq > /dev/null && \
 
 ADD ./ ./
 
-ENV NGINX_VERSION=1.17.3
+ENV NGINX_VERSION=1.17.4
 
 RUN git clone -b v0.0.19 --single-branch --depth 1 https://github.com/rryqszq4/ngx_php7.git > /dev/null