GH-48690: [R] Make "Can read Parquet files from a URL" less flaky

[HyukjinKwon]

Rationale for this change

The /raw/ path redirects to raw.githubusercontent.com and is arguably reliable (or rather recommended by GitHub itself) than blob/...?raw=true

Reference: https://developer.github.com/changes/24/

All other URL tests in this codebase already use /raw/ format (test-io.R, test-csv.R, etc.)

Disclaimer: I found this flakiness specifically in this test (with the non-raw link) that happens few times while other tests did not face this with raw links. I could not find the official claim related to it so it's based on my observation.

What changes are included in this PR?

This PR fixes the link of downloading the parquet file being used in the test, from arrow/blob to arrow/raw.

Are these changes tested?

No, I did not test.

Are there any user-facing changes?

No, test-only.

• GitHub Issue: [R] Make "Can read Parquet files from a URL" less flaky #48690

[github-actions]

Thanks for opening a pull request!

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See also:

• Other pull requests
• Contribution Guidelines - Contributing Overview

[github-actions]

⚠️ GitHub issue #48690 has been automatically assigned in GitHub to PR creator.