Courtesy of karol185 - based on #37429
Since Poland does not require states
(https://www.bitboost.com/ref/international-address-formats/poland/

)
Add them in the l10n_pl module and not with the other states in the
base module

closes odoo/odoo#42273

Signed-off-by: Martin Trigaux (mat) <mat@odoo.com>