Release v12.0.6

• fix(delivery note): change the text invoice to sales invoice on make button (#18666)
• fix: miscellaneous fixes (#18615)
• fix: Python3 urllib use in item_group.py (now uses six.moves) (#18642)
• fix: Filters for portal quotation list (#18689)
• fix(patch): force reload child docs (#18671)
• fix: Test Case
• fix: Test Cases
• fix: GSTR 3B report fixes
• fix: Fixed error message in Payment Entry for outstanding invoices not found via filters
• fix: get item from product bundle
• fix: allow to subcotract service raw materials
• fix: Set Maintenance Status fields as Read Only (#18633)
• fix: not able to transfer raw materials for subcontracted items (#18650)
• fix: group by condition in the payment reconciliation (#18657)
• fix: Show Cr or Dr symbol in chart of accounts based on balance (#18654)
• fix: Changes in print format due to attribute name changes in frappe (#18641)
• fix: Show created serial nos as links in message (#18635)
• fix(quickbooks): Do not build global search for QuickBooks Migrator (#18627)
• fix: Accounting period (#18630)
• test: fix test cases
• fix(Item Template): Fallback description string
• fix: TreeView fixes