use batch mode for running maven

[jtnord]

When looking at the output of the CI (codecoverage) job it was littered with download progress for artifacts.
This is needless spam so enable batch mode which prevents from asking for input and does not log download progress (but keeps the transfer logs).

Testing done

check the output of the CI codecoverage for this PR https://github.com/jenkinsci/oic-auth-plugin/pull/400/checks#step:4:52 does not contain download progress logs.

Submitter checklist

• Make sure you are opening from a topic/feature/bugfix branch (right side) and not your main branch!
• Ensure that the pull request title represents the desired changelog entry
• Please describe what you did
• Link to relevant issues in GitHub or Jira
• Link to relevant pull requests, esp. upstream and downstream changes
• Ensure you have provided tests - that demonstrates feature works or fixes the issue

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 72.47%. Comparing base (a5a97f8) to head (c0be63e).
Report is 18 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #400      +/-   ##
============================================
+ Coverage     71.88%   72.47%   +0.59%     
- Complexity      239      244       +5     
============================================
  Files            12       12              
  Lines          1010     1021      +11     
  Branches        145      148       +3     
============================================
+ Hits            726      740      +14     
+ Misses          206      201       -5     
- Partials         78       80       +2     

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