Minor updates to touchstone workflow

[VisruthSK]

Updated touchstone setup

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.70%. Comparing base (00a2855) to head (710ddfe).

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #377   +/-   ##
=======================================
  Coverage   92.70%   92.70%           
=======================================
  Files          31       31           
  Lines        3029     3029           
=======================================
  Hits         2808     2808           
  Misses        221      221           

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[github-actions]

This is how benchmark results would change (along with a 95% confidence interval in relative change) if 710ddfe is merged into master:

• ✔️loo_function: 1.95s -> 1.95s [-0.78%, +0.19%]
• 🚀loo_matrix: 1.77s -> 1.74s [-2.49%, -1.04%]
  Further explanation regarding interpretation and methodology can be found in the documentation.