A few minor upgrades before releasing

[waf]

Nuget upgrade. This upgrades everything EXCEPT:

• System.CommandLine -- there have been quite a few breaking changes in the stable release. It's not clear to me that there's much benefit in upgrading, but eventually we should handle this..

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 67.4%. Comparing base (9c0204b) to head (a0f7f65).
⚠️ Report is 8 commits behind head on main.

❌ Your project status has failed because the head coverage (67.4%) is below the target coverage (70.0%). You can increase the head coverage or adjust the target coverage.

Additional details and impacted files

@@           Coverage Diff           @@
##            main    #439     +/-   ##
=======================================
+ Coverage   67.1%   67.4%   +0.2%     
=======================================
  Files         90      90             
  Lines       6748    6813     +65     
  Branches     930     932      +2     
=======================================
+ Hits        4528    4592     +64     
- Misses      1896    1898      +2     
+ Partials     324     323      -1     

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