Merge pull request #1071 from kbond/mailer-test

[symfony/mailer] use `null://null` for `MAILER_DSN`

Author: fabpot

symfony/mailer/4.3/manifest.json

@@ -3,7 +3,7 @@
         "config/": "%CONFIG_DIR%/"
     },
     "env": {
-        "#1": "MAILER_DSN=smtp://localhost"
+        "#1": "MAILER_DSN=null://null"
     },
     "docker-compose": {
         "docker-compose.override.yml": {