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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This MR has been generated by Renovate Bot.

.gitlab-ci.yml

@@ -19,7 +19,7 @@ variables:
   MAVEN_CLI_OPTS: "--batch-mode --errors --fail-at-end --show-version -DinstallAtEnd=true -DdeployAtEnd=true"
 
 # This template uses jdk8 for verifying and deploying images
-image: maven:3.3.9-jdk-8
+image: maven:3.8.6-jdk-8
 
 # Cache downloaded dependencies and plugins between builds.
 # To keep cache across branches add 'key: "$CI_JOB_NAME"'