[R][CI] Typo in nightlies directory path #48098
Description
Describe the bug, including details regarding any error messages, version, and platform.
The R nightly workflow stopped uploading libarrow C++ binaries to nightlies.apache.org and Line 128 in .github/workflows/r_nightly.yml uses pattern "r-lib" which doesn't match the actual artifact names r-libarrow-*.
Component(s)
Continuous Integration, R