Make jdk-17 required

[fcojfernandez]

PR to make JDK-17 required and upgrade the parent pom to unblock #491

Changing from javaee to jakarta will be still part of #491

Testing done

Clean-up work, so just make sure existing tests are passing

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 71.73%. Comparing base (84359ac) to head (acd29f6).
Report is 9 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##             master     #496   +/-   ##
=========================================
  Coverage     71.73%   71.73%           
  Complexity      222      222           
=========================================
  Files            17       17           
  Lines          1033     1033           
  Branches        148      148           
=========================================
  Hits            741      741           
  Misses          201      201           
  Partials         91       91           

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[basil]

Extracted from #455 (as opposed to #491), but not correctly:

• Additions of commons-lang3-api and commons-text-api are part of the pac4j library upgrade (because pac4j 6.x depends on these Apache Commons libraries, but not pac4j 5.x) and not the Java upgrade; therefore, these changes make no sense in a Java upgrade PR
• Ditto for addition of Jackson exclusions
• Ditto for removal of Guava exclusion
• Missing Co-authored-by: Basil Crow <[…]>