[R] AMD64 Ubuntu 20.04 R 4.2 CI is failing due to branch rename

[wgtmac]

Describe the bug, including details regarding any error messages, version, and platform.

https://github.com/apache/arrow/actions/runs/4200029606/jobs/7285619420

  ══ Failed tests ════════════════════════════════════════════════════════════════
  ── Error ('test-io.R:73'): make_readable_file() works for non-filesystem URLs ──
  Error in `url(file, open = "rb")`: cannot open the connection to 'https://github.com/apache/arrow/raw/master/r/inst/v0.7.1.parquet'
  Backtrace:
      ▆
   1. └─arrow:::make_readable_file("https://github.com/apache/arrow/raw/master/r/inst/v0.7.1.parquet") at test-io.R:73:2
   2.   └─base::tryCatch(...)
   3.     └─base (local) tryCatchList(expr, classes, parentenv, handlers)
   4.       └─base (local) tryCatchOne(expr, names, parentenv, handlers[[1L]])
   5.         └─value[[3L]](cond)
   6.           ├─arrow:::MakeRConnectionInputStream(url(file, open = "rb"))
   7.           └─base::url(file, open = "rb")

We need to change https://github.com/apache/arrow/raw/master/r/inst/v0.7.1.parquet to https://github.com/apache/arrow/raw/main/r/inst/v0.7.1.parquet

Component(s)

R