fix: do not fetch a random inventory account when multiple inventory accounts exist (backport #57626)

[mergify]

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This is an automatic backport of pull request #57626 done by [Mergify](https://mergify.com).

[mergify]

Cherry-pick of 386a4ac has failed:

On branch mergify/bp/version-15-hotfix/pr-57626
Your branch is up to date with 'origin/version-15-hotfix'.

You are currently cherry-picking commit 386a4ac1f0.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --skip" to skip this patch)
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Changes to be committed:
	modified:   erpnext/accounts/doctype/sales_invoice/test_sales_invoice.py
	modified:   erpnext/stock/__init__.py
	modified:   erpnext/stock/doctype/landed_cost_voucher/test_landed_cost_voucher.py
	modified:   erpnext/stock/doctype/warehouse/test_warehouse.py

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   erpnext/stock/doctype/purchase_receipt/test_purchase_receipt.py

To fix up this pull request, you can check it out locally. See documentation: https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/checking-out-pull-requests-locally