chore: pin ROOT to 6.36.06 in workflow

[ianna]

see #3885 for details

[ianna]

@ariostas - I think, we should try to fix the issue and in the meantime not block the PRs from being merged.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 82.66%. Comparing base (3e5eae0) to head (0309c03).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

see 2 files with indirect coverage changes

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.

[ariostas]

Yeah, that sounds good. It kind of looks to me like it's a ROOT issue (maybe specific to the conda-fotge version). I'll take a look later today.

[github-actions]

The documentation preview is ready to be viewed at http://preview.awkward-array.org.s3-website.us-east-1.amazonaws.com/PR3886