Update Release Dates (#304)

Author: Jibola

docs/source/releases/5.1.x.rst

@@ -5,7 +5,7 @@ Django MongoDB Backend 5.1.x
 5.1.0 beta 3
 ============
 
-*May 13, 2025*
+*May 14, 2025*
 
 - Added support for a field's custom lookups and transforms in
   ``EmbeddedModelField``, e.g. ``ArrayField``’s ``contains``,

docs/source/releases/5.2.x.rst

@@ -5,7 +5,7 @@ Django MongoDB Backend 5.2.x
 5.2.0 beta 0
 ============
 
-*May 13, 2025*
+*May 14, 2025*
 
 Initial release from the state of :ref:`django-mongodb-backend 5.1.0 beta 2
 <django-mongodb-backend-5.1.0-beta-2>`.