ARROW-7164: [CI] Dev cron github action is failing every 15 minutes
ARROW-7164: [CI] Dev cron github action is failing every 15 minutes

See https://github.com/apache/arrow/actions?query=workflow%3A%22Dev+Cron%22. I noticed because it's spamming me every 15 minutes on my fork. [The error message](https://github.com/apache/arrow/commit/c7ae2e7514c0b5c89bf418a1ebc2257e28de7d5c/checks?check_suite_id=310205854#step:3:12) suggests that the problem is that we're calling require twice.

The cause was a fix in the 0.3.0 release of `github-script`, which made one of our workarounds redundant: https://github.com/actions/github-script/commit/71fcc9050d59a28dc237c70b7b2f8874d72501bf

This patch removes the workaround.

Closes #5824 from nealrichardson/fix-dev-cron and squashes the following commits:

e944f956b <Neal Richardson> Don't need to declare require anymore
1411f29ad <Neal Richardson> See if this fixes the cron script

Authored-by: Neal Richardson <beb59f0141269d2d04e73d0dcc1967b64ba87e13@gmail.com>
Signed-off-by: Sutou Kouhei <73218711cdd5d5c30ac66da3cc4d9d9204caf34b@clear-code.com>

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