chore(deps): update dependency odoo12-addon-product-contract-variable-quantity to v12.0.1.0.1.99.dev6

This MR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
odoo12-addon-product-contract-variable-quantity	==12.0.1.0.1.99.dev5 -> ==12.0.1.0.1.99.dev6

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