Upgrade to Roxygen 8.1.0

[StuartWheater]

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 37.02%. Comparing base (f6d844f) to head (d8f56e3).
⚠️ Report is 11 commits behind head on v7.0-dev.

Additional details and impacted files

@@             Coverage Diff              @@
##           v7.0-dev     #505      +/-   ##
============================================
+ Coverage     33.76%   37.02%   +3.25%     
============================================
  Files           143      143              
  Lines          5843     5756      -87     
============================================
+ Hits           1973     2131     +158     
+ Misses         3870     3625     -245     

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