chore(deps-dev): bump phpunit/phpunit from 9.6.7 to 9.6.8

Bumps [phpunit/phpunit](https://github.com/sebastianbergmann/phpunit) from 9.6.7 to 9.6.8.
- [Changelog](https://github.com/sebastianbergmann/phpunit/blob/9.6.8/ChangeLog-9.6.md)
- [Commits](https://github.com/sebastianbergmann/phpunit/compare/9.6.7...9.6.8)

---
updated-dependencies:
- dependency-name: phpunit/phpunit
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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

composer.lock

@@ -1279,16 +1279,16 @@
         },
         {
             "name": "phpunit/phpunit",
-            "version": "9.6.7",
+            "version": "9.6.8",
             "source": {
                 "type": "git",
                 "url": "https://github.com/sebastianbergmann/phpunit.git",
-                "reference": "c993f0d3b0489ffc42ee2fe0bd645af1538a63b2"
+                "reference": "17d621b3aff84d0c8b62539e269e87d8d5baa76e"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/sebastianbergmann/phpunit/zipball/c993f0d3b0489ffc42ee2fe0bd645af1538a63b2",
-                "reference": "c993f0d3b0489ffc42ee2fe0bd645af1538a63b2",
+                "url": "https://api.github.com/repos/sebastianbergmann/phpunit/zipball/17d621b3aff84d0c8b62539e269e87d8d5baa76e",
+                "reference": "17d621b3aff84d0c8b62539e269e87d8d5baa76e",
                 "shasum": ""
             },
             "require": {
@@ -1362,7 +1362,7 @@
             "support": {
                 "issues": "https://github.com/sebastianbergmann/phpunit/issues",
                 "security": "https://github.com/sebastianbergmann/phpunit/security/policy",
-                "source": "https://github.com/sebastianbergmann/phpunit/tree/9.6.7"
+                "source": "https://github.com/sebastianbergmann/phpunit/tree/9.6.8"
             },
             "funding": [
                 {
@@ -1378,7 +1378,7 @@
                     "type": "tidelift"
                 }
             ],
-            "time": "2023-04-14T08:58:40+00:00"
+            "time": "2023-05-11T05:14:45+00:00"
         },
         {
             "name": "psr/cache",
@@ -1877,16 +1877,16 @@
         },
         {
             "name": "sebastian/diff",
-            "version": "4.0.4",
+            "version": "4.0.5",
             "source": {
                 "type": "git",
                 "url": "https://github.com/sebastianbergmann/diff.git",
-                "reference": "3461e3fccc7cfdfc2720be910d3bd73c69be590d"
+                "reference": "74be17022044ebaaecfdf0c5cd504fc9cd5a7131"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/sebastianbergmann/diff/zipball/3461e3fccc7cfdfc2720be910d3bd73c69be590d",
-                "reference": "3461e3fccc7cfdfc2720be910d3bd73c69be590d",
+                "url": "https://api.github.com/repos/sebastianbergmann/diff/zipball/74be17022044ebaaecfdf0c5cd504fc9cd5a7131",
+                "reference": "74be17022044ebaaecfdf0c5cd504fc9cd5a7131",
                 "shasum": ""
             },
             "require": {
@@ -1931,7 +1931,7 @@
             ],
             "support": {
                 "issues": "https://github.com/sebastianbergmann/diff/issues",
-                "source": "https://github.com/sebastianbergmann/diff/tree/4.0.4"
+                "source": "https://github.com/sebastianbergmann/diff/tree/4.0.5"
             },
             "funding": [
                 {
@@ -1939,7 +1939,7 @@
                     "type": "github"
                 }
             ],
-            "time": "2020-10-26T13:10:38+00:00"
+            "time": "2023-05-07T05:35:17+00:00"
         },
         {
             "name": "sebastian/environment",