CompatHelper: bump compat for Documenter to 1, (keep existing compat)

[github-actions]

This pull request changes the compat entry for the Documenter package from 0.27 to 0.27, 1.
This keeps the compat entries for earlier versions.

Note: I have not tested your package with this new compat entry.
It is your responsibility to make sure that your package tests pass before you merge this pull request.

[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (263c5de) 38.54% compared to head (1e66900) 38.54%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #81   +/-   ##
=======================================
  Coverage   38.54%   38.54%           
=======================================
  Files          42       42           
  Lines        3217     3217           
=======================================
  Hits         1240     1240           
  Misses       1977     1977           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.