[PR #8558/e48acaf7 backport][3.10] Add followup changelog message for #5278 (#8576)

Co-authored-by: J. Nick Koston <[email protected]>
closes #8555

Author: patchback[bot]

CHANGES/8555.breaking.rst

@@ -0,0 +1,8 @@
+Creating :class:`aiohttp.TCPConnector`, :class:`aiohttp.ClientSession`, or
+ :class:`aiohttp.CookieJar` instances without a running event loop now
+ raises a :exc:`RuntimeError`.
+
+ -- by :user:`asvetlov`
+
+Creating these objects without a running event loop was deprecated
+in :issue:`3372` which was released in version 3.5.0.