[1.8.x] Refs #24104 -- Added missing release notes

* Prevented the ``static.serve`` view from producing ``ResourceWarning``\s in

  certain circumstances (security fix regression, :ticket:`24193`).

* Fixed schema check for ManyToManyField to look for internal type instead

  of checking class instance, so you can write custom m2m-like fields with the

  same behavior. (:ticket:`24104`).