PHP 7.3 packages are needed for php-launcher

This is part of request #13614 Error in REST tests PHP 7.2

Dockerfile

@@ -24,7 +24,23 @@ RUN yum -y install epel-release centos-release-scl && \
         php72-php-process \
         php72-php-sodium \
         php72-php-pecl-zip \
-	php72-php-pecl-redis \
+	    php72-php-pecl-redis \
+        php73-php-gd \
+        php73-php-pecl \
+        php73-php-pear \
+        php73-php-soap \
+        php73-php-mysqlnd \
+        php73-php-xml \
+        php73-php-mbstring \
+        php73-php-opcache \
+        php73-php-fpm \
+        php73-php-cli \
+        php73-php-pdo \
+        php73-php-xml \
+        php73-php-mbstring \
+        php73-php-process \
+        php73-php-pecl-zip \
+	    php73-php-pecl-redis \
         java-1.8.0-openjdk \
         rh-git29-git \
         sclo-git212-git \