chore(deps): update contract

This MR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
odoo12-addon-contract	==12.0.8.6.1.99.dev15 -> ==12.0.8.6.1.99.dev16
odoo12-addon-contract-sale	==12.0.3.0.0.99.dev2 -> ==12.0.3.0.0.99.dev3

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