UPGRADING: document ZipArchive::closeString() addition

DanielEScherzer · web-flow · commit 56d1ffca5854 · 2026-06-01T10:04:02.000-07:00
Follow-up to #21497 [skip ci]
diff --git a/UPGRADING b/UPGRADING
@@ -318,6 +318,7 @@ PHP 8.6 UPGRADE NOTES
 
 - Zip:
   . Added ZipArchive::openString() method.
+  . Added ZipArchive::closeString() method.
 
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 7. New Classes and Interfaces
