Update dependencies and add Sockets ext (#24)

* Update dependencies

* Add sockets

* Revert to 7.4

base/Dockerfile

@@ -8,17 +8,17 @@ ENV PATH /composer/vendor/bin:$PATH
 RUN set -e && \
     apk add --no-cache --update --progress git icu gmp && \
     apk add --no-cache --update --progress --virtual build-deps icu-dev gmp-dev && \
-    docker-php-ext-install -j$(nproc) pcntl intl bcmath gmp && \
+    docker-php-ext-install -j$(nproc) pcntl intl bcmath gmp sockets && \
     echo "memory_limit=-1" > $PHP_INI_DIR/conf.d/99_memory-limit.ini && \
     apk del build-deps && \
     rm -rf /var/cache/apk/* /var/tmp/* /tmp/*
 
-COPY --from=composer:2.0 /usr/bin/composer /usr/local/bin/composer
+COPY --from=composer:2 /usr/bin/composer /usr/local/bin/composer
 
 VOLUME ["/app"]
 WORKDIR /app
 
-RUN composer global require "symfony/process:^4.4|^5.1" "symfony/yaml:^4.4|^5.1" --no-update
+RUN composer global require "symfony/process:^4.4|^5.1|^6.0" "symfony/yaml:^4.4|^5.1|^6.0" --no-update
 ADD config-support.php /composer/vendor/bin/roave-bc-with-config-support
 
 ENTRYPOINT ["roave-bc-with-config-support"]