feat(CDA-507): update composer version (#55)

Author: ig0rN

docker/dev/php/Dockerfile

@@ -41,7 +41,7 @@ RUN pecl channel-update pecl.php.net && \
     php-ext-enable pcov rdkafka
 
 # COMPOSER: install binary
-RUN curl -sS https://getcomposer.org/installer | php -- --install-dir=/usr/bin --filename=composer --version=2.5.1
+COPY --from=composer:2.6 /usr/bin/composer /usr/bin/composer
 
 USER 'www-data'