chore(deps): update dependency phpstan/phpstan-phpunit to v0.12.21

This MR contains the following updates:

Package	Type	Update	Change
phpstan/phpstan-phpunit	require-dev	patch	0.12.20 -> 0.12.21

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Release Notes

phpstan/phpstan-phpunit

v0.12.21

Compare Source

• 6aaff11 - Add support for assertArrayHasKey (#​100)

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composer.lock

@@ -6975,16 +6975,16 @@
         },
         {
             "name": "phpstan/phpstan-phpunit",
-            "version": "0.12.20",
+            "version": "0.12.21",
             "source": {
                 "type": "git",
                 "url": "https://github.com/phpstan/phpstan-phpunit.git",
-                "reference": "efc009981af383eb3303f0ca9868c29acad7ce74"
+                "reference": "6aaff1196c4f808769774b49a94a60e5fdf18de7"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/phpstan/phpstan-phpunit/zipball/efc009981af383eb3303f0ca9868c29acad7ce74",
-                "reference": "efc009981af383eb3303f0ca9868c29acad7ce74",
+                "url": "https://api.github.com/repos/phpstan/phpstan-phpunit/zipball/6aaff1196c4f808769774b49a94a60e5fdf18de7",
+                "reference": "6aaff1196c4f808769774b49a94a60e5fdf18de7",
                 "shasum": ""
             },
             "require": {
@@ -7023,9 +7023,9 @@
             "description": "PHPUnit extensions and rules for PHPStan",
             "support": {
                 "issues": "https://github.com/phpstan/phpstan-phpunit/issues",
-                "source": "https://github.com/phpstan/phpstan-phpunit/tree/0.12.20"
+                "source": "https://github.com/phpstan/phpstan-phpunit/tree/0.12.21"
             },
-            "time": "2021-06-17T08:28:30+00:00"
+            "time": "2021-07-14T10:48:30+00:00"
         },
         {
             "name": "sebastian/diff",