doc: prepare release v0.13.0

Author: euronion

docs/release_notes.rst

@@ -16,6 +16,9 @@ Upcoming Release
 ..   The features listed below are not released yet, but will be part of the next release! 
 ..   To use the features already you have to use the ``master`` branch.
 
+`v0.13.0 <https://github.com/PyPSA/technology-data/releases/tag/v0.12.0>`__ (11th June 2025)
+=======================================================================================
+
 * Add several H2 production technologies (generic cost assumptions), fix FOM values and rename of efficiency to electricity-input in US cost assumptions for US-specific electrolyzer costs (https://github.com/PyPSA/technology-data/pull/222)
 
 `v0.12.0 <https://github.com/PyPSA/technology-data/releases/tag/v0.12.0>`__ (19th May 2025)