DM-54588: Release notes for v30.0.6

[timj]

Checklist

• ran Jenkins
• ran and inspected package-docs build
• 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 88.77%. Comparing base (299ea14) to head (063cd19).
⚠️ Report is 2 commits behind head on main.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #559      +/-   ##
==========================================
+ Coverage   88.72%   88.77%   +0.04%     
==========================================
  Files         159      159              
  Lines       22054    22054              
  Branches     2623     2623              
==========================================
+ Hits        19567    19578      +11     
+ Misses       1845     1839       -6     
+ Partials      642      637       -5     

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