Update drone runners OSes to not require use of toolchain PPA

[mborland]

No description provided.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.35%. Comparing base (ec801eb) to head (a23376a).
⚠️ Report is 3 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1394      +/-   ##
===========================================
+ Coverage    94.36%   95.35%   +0.99%     
===========================================
  Files          704      825     +121     
  Lines        49012    68203   +19191     
===========================================
+ Hits         46249    65034   +18785     
- Misses        2763     3169     +406     

see 167 files with indirect coverage changes

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