Release 3.11.15 (#10659)

We yanked 3.11.13 and 3.11.14 and reverted #10464 because of #10617 so
we are doing another release to make sure nobody has to go without the
other fixes in .13 and .14

<img width="643" alt="Screenshot 2025-03-31 at 5 42 58 PM"
src="https://github.com/user-attachments/assets/08317aa3-27f8-4400-87c1-15eeec0c3682"
/>

Author: bdraco

CHANGES.rst

@@ -10,6 +10,46 @@
 
 .. towncrier release notes start
 
+3.11.15 (2025-03-31)
+====================
+
+Bug fixes
+---------
+
+- Reverted explicitly closing sockets if an exception is raised during ``create_connection`` -- by :user:`bdraco`.
+
+  This change originally appeared in aiohttp 3.11.13
+
+
+  *Related issues and pull requests on GitHub:*
+  :issue:`10464`, :issue:`10617`, :issue:`10656`.
+
+
+
+
+Miscellaneous internal changes
+------------------------------
+
+- Improved performance of WebSocket buffer handling -- by :user:`bdraco`.
+
+
+  *Related issues and pull requests on GitHub:*
+  :issue:`10601`.
+
+
+
+- Improved performance of serializing headers -- by :user:`bdraco`.
+
+
+  *Related issues and pull requests on GitHub:*
+  :issue:`10625`.
+
+
+
+
+----
+
+
 3.11.14 (2025-03-16)
 ====================
 

CHANGES/10464.bugfix.rst

@@ -1,4 +1,4 @@
-__version__ = "3.11.15.dev0"
+__version__ = "3.11.15"
 
 from typing import TYPE_CHECKING, Tuple