Update phpunit

The latest version is easier to understand for static analyzers.

composer.json

@@ -42,7 +42,7 @@
         "jetbrains/phpstorm-stubs": "^2019.1",
         "nikic/php-parser": "^4.4",
         "phpstan/phpstan": "^0.12",
-        "phpunit/phpunit": "^8.4.1",
+        "phpunit/phpunit": "^8.5.5",
         "psalm/plugin-phpunit": "^0.10.0",
         "symfony/console": "^2.0.5|^3.0|^4.0|^5.0",
         "vimeo/psalm": "^3.11"

composer.lock

@@ -4,7 +4,7 @@
         "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
         "This file is @generated automatically"
     ],
-    "content-hash": "48526e240461408d90e490246c3b4531",
+    "content-hash": "9157c6d35dd39f5399592fd91126fa07",
     "packages": [
         {
             "name": "doctrine/cache",
@@ -1622,16 +1622,16 @@
         },
         {
             "name": "phpunit/phpunit",
-            "version": "8.4.1",
+            "version": "8.5.5",
             "source": {
                 "type": "git",
                 "url": "https://github.com/sebastianbergmann/phpunit.git",
-                "reference": "366a4a0f2b971fd43b7c351d621e8dd7d7131869"
+                "reference": "63dda3b212a0025d380a745f91bdb4d8c985adb7"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/sebastianbergmann/phpunit/zipball/366a4a0f2b971fd43b7c351d621e8dd7d7131869",
-                "reference": "366a4a0f2b971fd43b7c351d621e8dd7d7131869",
+                "url": "https://api.github.com/repos/sebastianbergmann/phpunit/zipball/63dda3b212a0025d380a745f91bdb4d8c985adb7",
+                "reference": "63dda3b212a0025d380a745f91bdb4d8c985adb7",
                 "shasum": ""
             },
             "require": {
@@ -1675,7 +1675,7 @@
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "8.4-dev"
+                    "dev-master": "8.5-dev"
                 }
             },
             "autoload": {
@@ -1701,7 +1701,17 @@
                 "testing",
                 "xunit"
             ],
-            "time": "2019-10-07T12:57:41+00:00"
+            "funding": [
+                {
+                    "url": "https://phpunit.de/donate.html",
+                    "type": "custom"
+                },
+                {
+                    "url": "https://github.com/sebastianbergmann",
+                    "type": "github"
+                }
+            ],
+            "time": "2020-05-22T13:51:52+00:00"
         },
         {
             "name": "psalm/plugin-phpunit",
@@ -2647,20 +2657,6 @@
             ],
             "description": "Symfony Console Component",
             "homepage": "https://symfony.com",
-            "funding": [
-                {
-                    "url": "https://symfony.com/sponsor",
-                    "type": "custom"
-                },
-                {
-                    "url": "https://github.com/fabpot",
-                    "type": "github"
-                },
-                {
-                    "url": "https://tidelift.com/funding/github/packagist/symfony/symfony",
-                    "type": "tidelift"
-                }
-            ],
             "time": "2020-03-30T11:41:10+00:00"
         },
         {