Adjust currency_year with inflation adjustment (#275)

* code: Adjust currency_year with inflation adjustment

* doc: Add release notes

* data: Regenerate files

* Update docs/release_notes.rst

Co-authored-by: Fabian Neumann <fabian.neumann@outlook.de>

* Update docs/release_notes.rst

Co-authored-by: Fabian Neumann <fabian.neumann@outlook.de>

---------

Co-authored-by: Fabian Neumann <fabian.neumann@outlook.de>

Author: euronion

docs/release_notes.rst

@@ -1,7 +1,6 @@
 
 ..
   SPDX-FileCopyrightText: Contributors to technology-data <https://github.com/pypsa/technology-data>
-
   SPDX-License-Identifier: GPL-3.0-only
 
 ##########################################
@@ -22,6 +21,8 @@ Upcoming Release
 
 * Add missing discount rate for OCGT in US-specific data. (https://github.com/PyPSA/technology-data/pull/269)
 
+* The "currency_year" column will now reflect the inflation adjusted currency year instead of the original currency year of the input data. (https://github.com/PyPSA/technology-data/pull/275)
+
 `v0.14.0 <https://github.com/PyPSA/technology-data/releases/tag/v0.14.0>`__ (13th February 2026)
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