Bump phpunit/phpunit from 7.5.8 to 7.5.9

Bumps [phpunit/phpunit](https://github.com/sebastianbergmann/phpunit) from 7.5.8 to 7.5.9.
- [Release notes](https://github.com/sebastianbergmann/phpunit/releases)
- [Changelog](https://github.com/sebastianbergmann/phpunit/blob/master/ChangeLog-7.5.md)
- [Commits](https://github.com/sebastianbergmann/phpunit/compare/7.5.8...7.5.9)

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

composer.lock

@@ -6514,16 +6514,16 @@
         },
         {
             "name": "phpunit/phpunit",
-            "version": "7.5.8",
+            "version": "7.5.9",
             "source": {
                 "type": "git",
                 "url": "https://github.com/sebastianbergmann/phpunit.git",
-                "reference": "c29c0525cf4572c11efe1db49a8b8aee9dfac58a"
+                "reference": "134669cf0eeac3f79bc7f0c793efbc158bffc160"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/sebastianbergmann/phpunit/zipball/c29c0525cf4572c11efe1db49a8b8aee9dfac58a",
+                "url": "https://api.github.com/repos/sebastianbergmann/phpunit/zipball/134669cf0eeac3f79bc7f0c793efbc158bffc160",
-                "reference": "c29c0525cf4572c11efe1db49a8b8aee9dfac58a",
+                "reference": "134669cf0eeac3f79bc7f0c793efbc158bffc160",
                 "shasum": ""
             },
             "require": {
@@ -6594,7 +6594,7 @@
                 "testing",
                 "xunit"
             ],
-            "time": "2019-03-26T13:23:54+00:00"
+            "time": "2019-04-19T15:50:46+00:00"
         },
         {
             "name": "sebastian/code-unit-reverse-lookup",