Update shadow plugin usage

[andrross]

Description

• Maintenance

Replace usage of a deprecated API in the gradle shadow plugin to prepare for an update to this dependency.

Check List

• New functionality includes testing
• New functionality has been documented
• New Roles/Permissions have a corresponding security dashboards plugin PR
• API changes companion pull request created
• Commits are signed per the DCO using --signoff

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.
For more information on following Developer Certificate of Origin and signing off your commits, please check here.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 73.78%. Comparing base (fc00ab1) to head (9909c82).
⚠️ Report is 6 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5953      +/-   ##
==========================================
+ Coverage   73.75%   73.78%   +0.03%     
==========================================
  Files         439      439              
  Lines       26884    26884              
  Branches     3980     3980              
==========================================
+ Hits        19827    19836       +9     
+ Misses       5172     5161      -11     
- Partials     1885     1887       +2     

see 7 files with indirect coverage changes

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