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ARROW-12660: [R] Post-4.0 adjustments for CRAN

Closes #10254 from jonkeane/ARROW-12660-release-cleanup

Lead-authored-by: Jonathan Keane <jkeane@gmail.com>
Co-authored-by: Neal Richardson <neal.p.richardson@gmail.com>
Co-authored-by: Lorenz Walthert <lorenz.walthert@icloud.com>
Signed-off-by: Jonathan Keane <jkeane@gmail.com>