Add note on change in pre-release behavior from Packaging 24.2

Author: notatallshaw

news/13163.feature.rst

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+Note: Packaging 24.2 changes how pre-release specifiers with ``<`` and ``>``
+behave. Including a pre-release version with these specifiers now implies
+accepting pre-releases (e.g., ``<2.0dev`` can include ``1.0rc1``). To avoid
+implying pre-releases, avoid specifying them (e.g., use ``<2.0``).
+The exception is ``!=``, which never implies pre-releases.