Add 'rowindex' and 'colindex' to list of aria attributes

[BrianESimon]

Adds 'rowindex' and 'colindex' to the list of recognized aria attributes as suggested here: https://developer.mozilla.org/en-US/docs/Web/Accessibility/ARIA/Roles/Row_Role

[codecov-io]

Codecov Report

Merging #2153 into master will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff           @@
##           master   #2153   +/-   ##
======================================
  Coverage     100%    100%           
======================================
  Files           1       1           
  Lines          49      49           
======================================
  Hits           49      49

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[Rich-Harris]

thanks 👍