Bump Release number to 15

[causten]

Motivation

Keeping the MIGX and ROCm versions in lock step

Technical Details

ROCm 7.1 maps to MIGX 2.14.0
ROCm 7.x maps to MIGX 2.15.0

Changelog Category

• • Added: New functionality.
• • Changed: Changes to existing functionality.
• • Removed: Functionality or support that has been removed. (Compared to a previous release)
• • Optimized: Component performance that has been optimized or improved.
• • Resolved Issues: Known issues from a previous version that have been resolved.
• • Not Applicable: This PR is not to be included in the changelog.

[bdevorem]

CI might be a real failure? otherwise lgtm

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #4378   +/-   ##
========================================
  Coverage    92.26%   92.26%           
========================================
  Files          560      560           
  Lines        26358    26358           
========================================
  Hits         24319    24319           
  Misses        2039     2039           

see 1 file with indirect coverage changes

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