the --diff option for flake8 was removed in version 6.0.0

[tompollard]

Currently we use flake8 --diff in our style checks:

physionet-build/.github/workflows/physionet-build-test.yml

Lines 118 to 137 in 5fdcd77

	- name: Run code style check on changed files relative to PR base branch
	if: github.event_name == 'pull_request'
	run: |
	git rev-parse --verify ${{ github.event.pull_request.base.sha }}
	git diff -U0 ${{ github.event.pull_request.base.sha }} HEAD | \
	flake8 --diff | \
	perl -ne '
	print; if (/^([^:]+):(\d+):(\d+):/) {
	$path = $1; $line = $2; $col = $3;
	open F, $path or die;
	print "\n";
	while (<F>) {
	next if $. < $line - 2;
	print " $_";
	if ($. == $line) { print " " x $col . "^\n\n"; last; }
	}
	close F;
	$status = 1;
	}
	END { exit $status }'

These tests are likely to start failing sometime soon, because the --diff option was removed from flake8 in version 6.0.0: https://flake8.pycqa.org/en/latest/release-notes/6.0.0.html