Remove usage of E_STRICT

This constant is deprecated in PHP 8.4. All E_STRICT warnings were
converted to E_NOTICE in PHP 8.0.

Psalm 5 still supports PHP 7.4, so _technically_ this constant could
still be useful for people running it on that version, but I suspect
most development and testing happens against 8.0+. It doesn't seem worth
more complicated version detection in this code to me.

src/Psalm/Internal/ErrorHandler.php

@@ -14,7 +14,6 @@
 use function set_exception_handler;
 
 use const E_ALL;
-use const E_STRICT;
 use const STDERR;
 
 /**
@@ -59,7 +58,7 @@ private function __construct()
 
     private static function setErrorReporting(): void
     {
-        error_reporting(E_ALL | E_STRICT);
+        error_reporting(E_ALL);
         ini_set('display_errors', '1');
     }