[FIX] l10n_ch: remove depricated account_report_external_value

In module `l10n_ch` after this commit https://github.com/odoo/odoo/commit/7a06ed07814ab8d9192d3a7ec15aba7f90f7294d
`account_report_expression` with name `account_tax_report_line_chtax_solde_formula` will be
depricated but it can't be deleted by upgrade because it has dependent external values.
On this commit I removed that depricated external values of that expression

closes odoo/odoo#151426

X-original-commit: b26f2e24f3e70e26bc98aafe0e87735a1256a9cd
Signed-off-by: Olivier Colson (oco) <oco@odoo.com>

addons/l10n_ch/__manifest__.py

@@ -19,7 +19,7 @@ A QR-bill will be generated if:
 The generation of the QR-bill is automatic if you meet the previous criteria. The QR-bill will be appended after the invoice when printing or sending by mail. 
 
     """,
-    'version': '11.1',
+    'version': '11.2',
     'category': 'Accounting/Localizations/Account Charts',
     'depends': [
         'account',

addons/l10n_ch/migrations/11.2/pre-migrate.py

@@ -0,0 +1,13 @@
+# -*- coding: utf-8 -*-
+
+
+def migrate(cr, version):
+    cr.execute("SELECT res_id FROM ir_model_data WHERE module = 'l10n_ch' AND name='account_tax_report_line_chtax_solde_formula'")
+
+    expression_id = cr.fetchone()
+
+    if expression_id:
+        cr.execute(
+            "DELETE FROM account_report_external_value WHERE target_report_expression_id = %s",
+            [expression_id[0]]
+        )