chore(deps): pin maven docker tag

This MR contains the following updates:

Package	Type	Update	Change
maven	image	pin	3.8.6-jdk-11 -> 3.8.6-jdk-11
maven	stage	pin	3.8.6-jdk-11 -> 3.8.6-jdk-11

📌 Important: Renovate will wait until you have merged this Pin MR before creating any upgrade MRs for the affected packages. Add the preset :preserveSemverRanges to your config if you instead don't wish to pin dependencies.

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