Release 6.4.0 (#1137)

<img width="677" alt="Screenshot 2025-04-09 at 7 32 54 AM"
src="https://github.com/user-attachments/assets/cb6e7d12-f46f-4787-8a12-e35922b9563b"
/>

- [x] prod test 1
- [x] prod test 2
- [x] aiohttp test

Author: bdraco

CHANGES.rst

@@ -14,6 +14,47 @@ Changelog
 
 .. towncrier release notes start
 
+6.4.0
+=====
+
+*(2025-04-09)*
+
+
+Bug fixes
+---------
+
+- Fixed a memory leak creating new :class:`~multidict.istr` objects -- by :user:`bdraco`.
+
+  The leak was introduced in 6.3.0
+
+  *Related issues and pull requests on GitHub:*
+  :issue:`1133`.
+
+- Fixed reference counting when calling :py:meth:`multidict.MultiDict.update` -- by :user:`bdraco`.
+
+  The leak was introduced in 4.4.0
+
+  *Related issues and pull requests on GitHub:*
+  :issue:`1135`.
+
+
+Features
+--------
+
+- Switched C Extension to use heap types and the module state.
+
+  *Related issues and pull requests on GitHub:*
+  :issue:`1125`.
+
+- Started building armv7l wheels -- by :user:`bdraco`.
+
+  *Related issues and pull requests on GitHub:*
+  :issue:`1127`.
+
+
+----
+
+
 6.3.2
 =====
 

CHANGES/1125.feature

@@ -22,7 +22,7 @@
     "getversion",
 )
 
-__version__ = "6.3.3.dev0"
+__version__ = "6.4.0"
 
 
 if TYPE_CHECKING or not USE_EXTENSIONS: