[R] Fix CSV timestamp_parsers test on R-devel

[asfimport]

Apparently there is a change in the development version of R with respect to timezone handling. I suspect it is this: https://github.com/wch/r-source/blob/trunk/doc/NEWS.Rd#L296-L300

It causes this failure:

── 1. Failure: read_csv_arrow() can read timestamps (@test-csv.R#216)  ─────────
`tbl` not equal to `df`.
Component "time": 'tzone' attributes are inconsistent ('UTC' and '')

── 2. Failure: read_csv_arrow() can read timestamps (@test-csv.R#219)  ─────────
`tbl` not equal to `df`.
Component "time": 'tzone' attributes are inconsistent ('UTC' and '')

This needs to be fixed for the CRAN release because they check on the devel version. But it doesn't need to block the 2.0 release candidate because I can (at minimum) skip these tests before submitting to CRAN (FYI @kszucs)

I'll also add a CI job to test on R-devel. I just removed 2 R jobs so we can afford to add one back.

cc @romainfrancois

Reporter: Neal Richardson / @nealrichardson
Assignee: Neal Richardson / @nealrichardson

PRs and other links:

• GitHub Pull Request #8447

_{Note: This issue was originally created as ARROW-10270. Please see the migration documentation for further details.}

[asfimport]

Neal Richardson / @nealrichardson:
Issue resolved by pull request 8447
#8447