Update ci

[mborland]

Fix deprecations and add newer clangs

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.0%. Comparing base (f34b02b) to head (52be07d).
Report is 7 commits behind head on develop.

Additional details and impacted files

@@            Coverage Diff            @@
##           develop    #896     +/-   ##
=========================================
+ Coverage     99.0%   99.0%   +0.1%     
=========================================
  Files          235     235             
  Lines        16955   16955             
  Branches      1822    1822             
=========================================
+ Hits         16769   16770      +1     
+ Misses         186     185      -1     

Files with missing lines	Coverage Δ
test/test_assoc_legendre.cpp	100.0% <ø> (ø)
test/test_zeta.cpp	100.0% <ø> (ø)

... and 1 file with indirect coverage changes

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