Prepare the 3.28.0 release

CHANGELOG

@@ -1,4 +1,4 @@
-# 3.28.0 (2026-XX-XX)
+# 3.28.0 (2026-07-03)
 
  * Render backed enums using their backing value in the `html_attr` function
  * Fix empty Markup values being treated as truthy in and, or, xor, not, ternary, and elvis expressions

src/Environment.php

@@ -43,12 +43,12 @@ use Twig\TokenParser\TokenParserInterface;
  */
 class Environment
 {
-    public const VERSION = '3.28.0-DEV';
+    public const VERSION = '3.28.0';
     public const VERSION_ID = 32800;
     public const MAJOR_VERSION = 3;
     public const MINOR_VERSION = 28;
     public const RELEASE_VERSION = 0;
-    public const EXTRA_VERSION = 'DEV';
+    public const EXTRA_VERSION = '';
 
     private $charset;
     private $loader;