chore(deps): update pos

This MR contains the following updates:

Package	Update	Change
odoo12-addon-pos-mail-receipt	patch	==12.0.1.0.0.99.dev14 -> ==12.0.1.0.0.99.dev15
odoo12-addon-pos-margin	patch	==12.0.2.0.2.99.dev1 -> ==12.0.2.0.2.99.dev2
odoo12-addon-pos-order-to-sale-order	patch	==12.0.1.0.3.99.dev7 -> ==12.0.1.0.4.99.dev5

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