test: add param type

Co-authored-by: John Paul E. Balandan, CPA <51850998+paulbalandan@users.noreply.github.com>

Author: kenjis

tests/system/Filters/InvalidCharsTest.php

@@ -144,10 +144,8 @@ public function stringWithLineBreakAndTabProvider()
 
     /**
      * @dataProvider stringWithControlCharsProvider
-     *
-     * @param string $input
      */
-    public function testCheckControlStringWithControlCharsCausesException($input)
+    public function testCheckControlStringWithControlCharsCausesException(string $input)
     {
         $this->expectException(SecurityException::class);
         $this->expectExceptionMessage('Invalid Control characters in get:');