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GH-38227: [R] Fix non-unicode character errors in nightly builds (#38232)


### Rationale for this change

We have several nightly builds failing with errors building the manual as a result of unicode characters. The unicode characters aren't new, so I'm not sure why this happened now.

### What changes are included in this PR?

Install a distribution of latex that supports unicode characters (maybe)?

### Are these changes tested?

Yes

### Are there any user-facing changes?

No
* Closes: #38227

Lead-authored-by: Dewey Dunnington <dewey@voltrondata.com>
Co-authored-by: Dewey Dunnington <dewey@fishandwhistle.net>
Signed-off-by: Jacob Wujciak-Jens <jacob@wujciak.de>