minor #5429 DX: Drop speedtrap PHPUnit listener (keradus)

This PR was merged into the 2.17 branch.

Discussion
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DX: Drop speedtrap PHPUnit listener

PHPUnit now manages time of execution on its own, no need for plugin.

trying to solve random test timeouts at Travis, maybe there is a conflict between native mechanism and plugin.

Commits
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cb642af5e DX: Drop speedtrap PHPUnit listener

composer.json

@@ -32,7 +32,6 @@
         "symfony/stopwatch": "^3.0 || ^4.0 || ^5.0"
     },
     "require-dev": {
-        "johnkary/phpunit-speedtrap": "^1.1 || ^2.0 || ^3.0",
         "justinrainbow/json-schema": "^5.0",
         "keradus/cli-executor": "^1.4",
         "mikey179/vfsstream": "^1.6",

phpunit.xml.dist

@@ -43,15 +43,6 @@
     </filter>
 
     <listeners>
-        <listener class="JohnKary\PHPUnit\Listener\SpeedTrapListener">
-            <arguments>
-                <array>
-                    <element key="slowThreshold">
-                        <integer>100</integer>
-                    </element>
-                </array>
-            </arguments>
-        </listener>
         <listener class="Symfony\Bridge\PhpUnit\SymfonyTestsListener"/>
     </listeners>