Merge branch '6.4' into 7.1

* 6.4:
  relax format assertions for fstat() results on Windows
  update ICU data from 75.1 to 76.1
  fix referencing the SYMFONY_VERSION env var
  handle error results of DateTime::modify()

Author: xabbuh

Tests/Caster/SplCasterTest.php

@@ -104,7 +104,7 @@ public function testCastFileObject()
   flags: DROP_NEW_LINE|SKIP_EMPTY
   maxLineLen: 0
   fstat: array:26 [
-    "dev" => %d
+    "dev" => %i
     "ino" => %i
     "nlink" => %d
     "rdev" => 0