Bump phpunit/phpunit from 8.5.4 to 8.5.5

Bumps [phpunit/phpunit](https://github.com/sebastianbergmann/phpunit) from 8.5.4 to 8.5.5.
- [Release notes](https://github.com/sebastianbergmann/phpunit/releases)
- [Changelog](https://github.com/sebastianbergmann/phpunit/blob/master/ChangeLog-8.5.md)
- [Commits](https://github.com/sebastianbergmann/phpunit/compare/8.5.4...8.5.5)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

composer.lock

@@ -4982,16 +4982,16 @@
         },
         {
             "name": "phpunit/phpunit",
-            "version": "8.5.4",
+            "version": "8.5.5",
             "source": {
                 "type": "git",
                 "url": "https://github.com/sebastianbergmann/phpunit.git",
-                "reference": "8474e22d7d642f665084ba5ec780626cbd1efd23"
+                "reference": "63dda3b212a0025d380a745f91bdb4d8c985adb7"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/sebastianbergmann/phpunit/zipball/8474e22d7d642f665084ba5ec780626cbd1efd23",
-                "reference": "8474e22d7d642f665084ba5ec780626cbd1efd23",
+                "url": "https://api.github.com/repos/sebastianbergmann/phpunit/zipball/63dda3b212a0025d380a745f91bdb4d8c985adb7",
+                "reference": "63dda3b212a0025d380a745f91bdb4d8c985adb7",
                 "shasum": ""
             },
             "require": {
@@ -5061,7 +5061,7 @@
                 "testing",
                 "xunit"
             ],
-            "time": "2020-04-23T04:39:42+00:00"
+            "time": "2020-05-22T13:51:52+00:00"
         },
         {
             "name": "scrivo/highlight.php",
@@ -5844,6 +5844,5 @@
     "platform": {
         "php": "^7.2.5"
     },
-    "platform-dev": [],
-    "plugin-api-version": "1.1.0"
+    "platform-dev": []
 }