docker.apache: update php to 7.4, composer to 1.9.1, fix gd configure flags

w.r.t gd see also docker-library/php#912

Author: Strubbl

contrib/docker/Dockerfile.apache

@@ -1,7 +1,7 @@
-FROM php:7.3-apache-buster
+FROM php:7.4-apache-buster
 
-ARG COMPOSER_VERSION="1.8.5"
-ARG COMPOSER_CHECKSUM="4e4c1cd74b54a26618699f3190e6f5fc63bb308b13fa660f71f2a2df047c0e17"
+ARG COMPOSER_VERSION="1.9.1"
+ARG COMPOSER_CHECKSUM="1f210b9037fcf82670d75892dfc44400f13fe9ada7af9e787f93e50e3b764111"
 
 RUN apt-get update \
  && apt-get install -y --no-install-recommends apt-utils \
@@ -13,10 +13,10 @@ RUN apt-get update \
  && locale-gen && update-locale \
  && docker-php-source extract \
  && docker-php-ext-configure gd \
-      --enable-freetype \
-      --with-jpeg-dir=/usr/lib/x86_64-linux-gnu/ \
-      --with-xpm-dir=/usr/lib/x86_64-linux-gnu/ \
-      --with-webp-dir=/usr/lib/x86_64-linux-gnu/ \
+      --with-freetype \
+      --with-jpeg \
+      --with-webp \
+      --with-xpm \
  && docker-php-ext-install pdo_mysql pdo_pgsql pdo_sqlite pcntl gd exif bcmath intl zip curl \
  && pecl install imagick \
  && docker-php-ext-enable imagick pcntl imagick gd exif zip curl \