Enforce explicit plugin versions

[Tillerino]

Hi!

I recently bumped the Maven version in Nixpgks (NixOS/nixpkgs#238746) and ran into some small but annoying manual effort w.r.t. the digital package. The issue is that digital is packaged using the double invocation method which unfortunately breaks if not all maven plugin versions are set explicitly.

We're extending the documentation to prevent this (NixOS/nixpkgs#238774), but I'm reaching out to fix the packages which have already been packaged. In this PR, we explicitly set the versions of a few plugins which hadn't had their versions set explicitly before and add a check with the enforcer plugin to make sure this won't accidentally break in the future.

Note that the exact versions of the plugins that you're using are not important to us and please do change them as you see fit. We only ask that you explicitly set the versions of all plugins so that downstream upgrades can run automatically.

[codecov-commenter]

Codecov Report

Patch and project coverage have no change.

Comparison is base (220e551) 56.5% compared to head (4e0873a) 56.5%.

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Additional details and impacted files

@@           Coverage Diff            @@
##             master   #1170   +/-   ##
========================================
  Coverage      56.5%   56.5%           
- Complexity     6578    6579    +1     
========================================
  Files           680     680           
  Lines         35562   35562           
  Branches       4800    4800           
========================================
+ Hits          20117   20119    +2     
+ Misses        14235   14234    -1     
+ Partials       1210    1209    -1     

see 1 file with indirect coverage changes

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