DM-53079: Use modern license specifier

[timj]

Checklist

• ran Jenkins
• added a release note for user-visible changes to doc/changes

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 89.82%. Comparing base (4123807) to head (0e66559).
⚠️ Report is 7 commits behind head on main.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #216      +/-   ##
==========================================
+ Coverage   89.80%   89.82%   +0.01%     
==========================================
  Files          51       51              
  Lines        5465     5465              
  Branches      539      539              
==========================================
+ Hits         4908     4909       +1     
+ Misses        458      457       -1     
  Partials       99       99              

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