PHP 8.2 Deprecated cleaning

Tests/XdiffTest.php

@@ -189,8 +189,8 @@ to this document.
         $date = date("Y-m-d H:i:s.u00");
       // DST must answer +0200 in winter and +0100 in summer
         $dst = date("O");
-        $this->assertSame($res, "--- Original ${date}0 $dst
-+++ New ${date}1 $dst
+        $this->assertSame($res, "--- Original {$date}0 $dst
++++ New {$date}1 $dst
 @@ -0,0 +1,6 @@
 +This is an important
 +notice! It should