[FIX] core: ensure `odoo.upgrade` __path__ contains real directories
mimic what is done for `odoo.addons` __path__.
closes odoo/odoo#121045
Signed-off-by: 
Christophe Simonis <chs@odoo.com>
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mimic what is done for `odoo.addons` __path__.
closes odoo/odoo#121045
Signed-off-by: Christophe Simonis <chs@odoo.com>