[IMP] l10n_ar_account_tax_settlement: update inflation indexes.

Add inflation index December 2025 from https://www.facpce.org.ar/indices-facpce/ "Indice RT 6".
Task Adhoc side: 28323

closes #891

X-original-commit: 798ac55
Signed-off-by: Julia Elizondo - jue (#l10n) <jue@adhoc.com.ar>
Signed-off-by: Pablo Montenegro - pam (#l10n) <pam@adhoc.com.ar>

Author: pablohmontenegro

l10n_ar_account_tax_settlement/__manifest__.py

@@ -19,7 +19,7 @@
 ##############################################################################
 {
     "name": "Tax Settlements For Argentina",
-    "version": "18.0.1.9.0",
+    "version": "18.0.1.10.0",
     "category": "Accounting",
     "author": "ADHOC SA",
     "website": "www.adhoc.com.ar",

l10n_ar_account_tax_settlement/data/inflation_adjustment_index.xml

@@ -775,4 +775,9 @@
         <field name="value">9841.3581</field>
     </record>
 
+    <record id="index_12_2025" model="inflation.adjustment.index">
+        <field name="date" eval="time.strftime('2025-12-01')"/>
+        <field name="value">10121.3715</field>
+    </record>
+
 </odoo>