Add whatsnew entry

Author: AdamRJensen

docs/sphinx/source/whatsnew/v0.12.1.rst

@@ -6,7 +6,10 @@ v0.12.1 (XXXX, 2025)
 
 Breaking Changes
 ~~~~~~~~~~~~~~~~
-
+* The functions :py:func:`~pvlib.iotools.read_pvgis_hourly` and
+  :py:func:`~pvlib.iotools.get_pvgis_hourly` now returns  ``(data,meta)``
+  instead of ``(data,inputs,meta)`` following the iotools convention.
+  (:pull:`2462`)
 
 Deprecations
 ~~~~~~~~~~~~