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GH-55377: [R][CI] Windows Rtools40 jobs fail since 2026-10-30: setup-…

…r hard-codes a cran.rstudio.com URL for Rtools40 that now 404s (#55378)

### Rationale for this change

Nightly builds failing due to a change in RTools URL and problem with job

### What changes are included in this PR?

Don't pass in rtools version, as this can be inferred anyway

### Are these changes tested?

No

### Are there any user-facing changes?

No

**PR code and description written by:**

- [ ] Human
- [x] AI

**Reviewed before submission by:**

- [x] Human
- [x] AI
- [ ] Not reviewed

* GitHub Issue: #55377

Authored-by: Nic Crane <thisisnic@gmail.com>
Signed-off-by: Nic Crane <thisisnic@gmail.com>

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