remove sid stuff

.circleci/config.yml

@@ -19,10 +19,8 @@ job-references:
   install_dependencies: &install_dependencies
     name: "Install Dependencies"
     command: |
-      sudo apt-get update && sudo apt-get install subversion
+      sudo apt-get update && sudo apt-get install subversion mariadb-client
       sudo -E docker-php-ext-install mysqli
-      sudo sh -c "printf '\ndeb http://ftp.us.debian.org/debian sid main\n' >> /etc/apt/sources.list"
-      sudo apt-get update && sudo apt-get install mariadb-client
 
   php_job: &php_job
     environment: