Use raw strings in some places

[MichaelChirico]

Follow-up to #2603.

Just to give an example of what's available to us with an R 4.0 dependency. I'm sure there's more. I'm also fairly confident tests will fail here 😅

[IndrajeetPatil]

I'm also fairly confident tests will fail here 😅

You underestimate yourself, sir 😃

The tests look much cleaner now!

[AshesITR]

Checks need to be triggered here somehow.
The change LGTM.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 4 lines in your changes missing coverage. Please review.

Project coverage is 97.96%. Comparing base (fc2268f) to head (dbd82a9).
Report is 14 commits behind head on main.

Files	Patch %	Lines
R/zzz.R	0.00%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2604      +/-   ##
==========================================
- Coverage   98.15%   97.96%   -0.19%     
==========================================
  Files         125      126       +1     
  Lines        5738     5748      +10     
==========================================
- Hits         5632     5631       -1     
- Misses        106      117      +11     

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