build(deps-dev): update phpunit/phpunit requirement

Updates the requirements on [phpunit/phpunit](https://github.com/sebastianbergmann/phpunit) to permit the latest version.
- [Release notes](https://github.com/sebastianbergmann/phpunit/releases)
- [Changelog](https://github.com/sebastianbergmann/phpunit/blob/main/ChangeLog-9.5.md)
- [Commits](sebastianbergmann/phpunit@9.5.25...9.5.26)

---
updated-dependencies:
- dependency-name: phpunit/phpunit
  dependency-type: direct:development
...

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

Author: dependabot[bot]

composer.json

@@ -31,7 +31,7 @@
     "phpstan/extension-installer": "^1.1",
     "phpstan/phpstan": "^0.12",
     "phpstan/phpstan-phpunit": "^0.12",
-    "phpunit/phpunit": "^9.5.25",
+    "phpunit/phpunit": "^9.5.26",
     "slam/phpstan-laminas-framework": "^0.12",
     "squizlabs/php_codesniffer": "^3.7"
   },

tests/TestSuite/CliTest.php

@@ -93,4 +93,17 @@ public function testRunWithOptionsMustBeUsedByTheLinter()
             '.test { display: block; }'
         ]));
     }
+
+    public function testRunWithInvalidOptionsFormatShouldReturnAnError()
+    {
+        $this->expectOutputString(
+            "\033[31m/!\ Error: Unable to parse option argument: Syntax error\033[0m" . PHP_EOL .
+                PHP_EOL
+        );
+        $this->assertEquals(1, $this->cli->run([
+            'php-css-lint',
+            '--options={ "allowedIndentationChars":  }',
+            '.test { display: block; }'
+        ]));
+    }
 }