ARROW-13857: [R][CI] Remove checkbashisms download
ARROW-13857: [R][CI] Remove checkbashisms download

Closes #11088 from nealrichardson/remove-checkbashisms-dl

Authored-by: Neal Richardson <beb59f0141269d2d04e73d0dcc1967b64ba87e13@gmail.com>
Signed-off-by: Neal Richardson <beb59f0141269d2d04e73d0dcc1967b64ba87e13@gmail.com>

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