Update maven Docker tag to v3.8.6 - autoclosed

This MR contains the following updates:

Package	Type	Update	Change
maven	image	minor	3.3.9-jdk-8 -> 3.8.6-jdk-8

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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.

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Ignore: Close this MR and you won't be reminded about this update again.

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This MR has been generated by Renovate Bot.