fix: use `list()` on self mutating iteration

https://github.com/frappe/erpnext/issues/30325

Signed-off-by: Sabu Siyad <hello@ssiyad.com>
diff --git a/erpnext/erpnext_integrations/taxjar_integration.py b/erpnext/erpnext_integrations/taxjar_integration.py
index b8893aa..2d9093b 100644
--- a/erpnext/erpnext_integrations/taxjar_integration.py
+++ b/erpnext/erpnext_integrations/taxjar_integration.py
@@ -302,7 +302,7 @@
 			item.tax_collectable = flt(0)
 			item.taxable_amount = flt(0)
 
-		for tax in doc.taxes:
+		for tax in list(doc.taxes):
 			if tax.account_head == TAX_ACCOUNT_HEAD:
 				doc.taxes.remove(tax)
 		return