chore(deps): update contract

This MR contains the following updates:

Package	Update	Change
odoo11-addon-contract	patch	==11.0.4.1.0.99.dev4 -> ==11.0.4.1.0.99.dev18
odoo11-addon-contract-sale-invoicing	patch	==11.0.1.0.0.99.dev8 -> ==11.0.1.0.0.99.dev10
odoo11-addon-contract-variable-quantity	patch	==11.0.1.3.0.99.dev6 -> ==11.0.1.3.0.99.dev12

---

Configuration

📅 Schedule: Branch creation - At any time (no schedule defined), Automerge - At any time (no schedule defined).

🚦 Automerge: Disabled by config. Please merge this manually once you are satisfied.

♻ Rebasing: Whenever MR becomes conflicted, or you tick the rebase/retry checkbox.

👻 Immortal: This MR will be recreated if closed unmerged. Get config help if that's undesired.

---

• If you want to rebase/retry this MR, check this box

---

This MR has been generated by Renovate Bot.