[FIX] hr, purchase: update import templates

* the employees file apparently never worked as the marital status was
  updated before template files were added (respectively
  0eb58775 and
  b60de0db)
* the purchase template was never updated to reflect the Big Demo Data Changes
  (58fc4e44).

Fixes #39074

Employees file update split off of task 2059779.

closes odoo/odoo#39822

X-original-commit: 80a2f687
Signed-off-by: Xavier Morel (xmo) <xmo@odoo.com>
Co-authored-by: Prakash Prajapati <ppr@odoo.com>