[Snyk] Security upgrade maven from 3.6.3-jdk-8 to 3.8.3-jdk-8

[snyk-bot]

Keeping your Docker base image up-to-date means you’ll benefit from security fixes in the latest version of your chosen image.

Changes included in this PR

• Dockerfile

We recommend upgrading to maven:3.8.3-jdk-8, as this image has only 87 known vulnerabilities. To do this, merge this pull request, then verify your application still works as expected.

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