DM-54588: v30.0.6 release notes

[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 83.62%. Comparing base (42d460a) to head (6ed6e41).
⚠️ Report is 2 commits behind head on main.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #141   +/-   ##
=======================================
  Coverage   83.62%   83.62%           
=======================================
  Files          36       36           
  Lines        7958     7958           
  Branches      956      956           
=======================================
  Hits         6655     6655           
  Misses       1007     1007           
  Partials      296      296           

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