Improve code cleaning

[michael-doubez]

Clean pom and update checkstyle

Testing done

Submitter checklist

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1. Make sure you are opening from a **topic/feature/bugfix branch** (right side) and not your main branch!

   Make sure you are opening from a topic/feature/bugfix branch (right side) and not your main branch!
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2. Ensure that the pull request title represents the desired changelog entry

   Ensure that the pull request title represents the desired changelog entry
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3. Please describe what you did

   Please describe what you did
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4. Link to relevant issues in GitHub or Jira

   Link to relevant issues in GitHub or Jira
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5. Link to relevant pull requests, esp. upstream and downstream changes

   Link to relevant pull requests, esp. upstream and downstream changes
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6. Ensure you have provided tests - that demonstrates feature works or fixes the issue

   Ensure you have provided tests - that demonstrates feature works or fixes the issue
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[codecov]

Codecov Report

Attention: Patch coverage is 58.26772% with 53 lines in your changes are missing coverage. Please review.

Project coverage is 73.16%. Comparing base (22331f0) to head (c3d9244).
Report is 9 commits behind head on master.

Files	Patch %	Lines
...va/org/jenkinsci/plugins/oic/OicSecurityRealm.java	53.06%	34 Missing and 12 partials ⚠️
...ain/java/org/jenkinsci/plugins/oic/OicSession.java	57.14%	2 Missing and 1 partial ⚠️
...gins/oic/WellKnownOpenIDConfigurationResponse.java	60.00%	2 Missing ⚠️
...sci/plugins/oic/JenkinsAwareConnectionFactory.java	0.00%	0 Missing and 1 partial ⚠️
...va/org/jenkinsci/plugins/oic/OicTokenResponse.java	88.88%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #289      +/-   ##
============================================
+ Coverage     71.90%   73.16%   +1.25%     
+ Complexity      194      189       -5     
============================================
  Files             9        9              
  Lines           744      775      +31     
  Branches        124      113      -11     
============================================
+ Hits            535      567      +32     
- Misses          150      151       +1     
+ Partials         59       57       -2     

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