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

[github-actions]

This pull request changes the compat entry for the ADTypes package from 0.2.6 to 0.2.6, 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

All modified and coverable lines are covered by tests ✅

Project coverage is 41.29%. Comparing base (b389d0e) to head (ac37741).
Report is 14 commits behind head on master.

❗ Current head ac37741 differs from pull request most recent head 52f7803. Consider uploading reports for the commit 52f7803 to get more accurate results

Additional details and impacted files

@@             Coverage Diff             @@
##           master     #412       +/-   ##
===========================================
- Coverage   86.77%   41.29%   -45.48%     
===========================================
  Files          46       47        +1     
  Lines        2851     3160      +309     
===========================================
- Hits         2474     1305     -1169     
- Misses        377     1855     +1478     

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[gdalle]

Closed in favor of #426