chore(deps): update contract

This MR contains the following updates:

Package	Update	Change
odoo12-addon-contract	patch	==12.0.8.3.8.99.dev3 -> ==12.0.8.7.0.99.dev3
odoo12-addon-contract-sale	patch	==12.0.3.0.0.99.dev1 -> ==12.0.3.0.0.99.dev3
odoo12-addon-contract-sale-invoicing	patch	==12.0.1.0.3 -> ==12.0.1.0.4
odoo12-addon-contract-variable-qty-timesheet	patch	==12.0.1.0.0.99.dev1 -> ==12.0.1.0.1.99.dev2
odoo12-addon-contract-variable-quantity	patch	==12.0.3.1.0.99.dev3 -> ==12.0.3.1.1.99.dev5

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