Merge pull request #95 from nbgrp/dependabot/composer/tools/psalm/psalm/plugin-symfony-4.0.0

Bump psalm/plugin-symfony from 3.1.10 to 4.0.0 in /tools/psalm

Author: a-menshchikov

tools/psalm/composer.json

@@ -8,7 +8,7 @@
         "symfony/polyfill-php80": "*"
     },
     "require-dev": {
-        "psalm/plugin-symfony": "^3.1.3",
+        "psalm/plugin-symfony": "^4.0.0",
         "vimeo/psalm": "^4.20.0"
     },
     "config": {