infra: update azure to macOS-12 to avoid deprecation warning

[romani]

from #15001 (comment)

it becomes a pain to restart.

##[error]This is a scheduled macOS-11 brownout. The macOS-11 environment 
is deprecated and will be removed on June 28th, 2024.
,##[error]The remote provider was unable to process the request.
Started: Yesterday at 10:53 AM
Duration: 20h 8m 52s

Job preparation parameters
9 queue time variables used

https://dev.azure.com/romanivanovjr/romanivanovjr/_build/results?buildId=21757&view=logs&j=d72e04f6-d294-5bfe-b3cd-ffcb523f40f9

[Zopsss]

new error: https://dev.azure.com/romanivanovjr/romanivanovjr/_build/results?buildId=21770&view=logs&j=30eb8b1d-aec7-5534-8285-cea9e43390b9&t=9b4e45b1-0f32-5d25-c850-57a5aa9f241d

now the CIs are not getting cancelled but they are giving the above error

[romani]

Looks like this code is returned non zero exit code

checkstyle/.ci/validation.sh

Lines 1137 to 1149 in 0c86b2f

	ci-temp-check)
	fail=0
	mkdir -p .ci-temp
	if [ -z "$(ls -A .ci-temp)" ]; then
	echo "Folder .ci-temp/ is empty."
	else
	echo "Folder .ci-temp/ is not empty. Verification failed."
	echo "Contents of .ci-temp/:"
	fail=1
	fi
	ls -A .ci-temp
	sleep 5s
	exit $fail

From log

usage: sleep seconds

It might be that sleep command changes arguments, we can remove this sleep, it is from time we used Travis heavily and it had problem of logs being cut due to quick shutdown of failed containers.

[rnveach]

we can remove this sleep, it is from time we used Travis heavily and it had problem of logs being cut

https://github.com/search?q=repo%3Acheckstyle%2Fcheckstyle%20%22ci-temp-check%22&type=code
All CIs should be manually checked to ensure removing this won't be an issue.

[romani]

This sleep was Travis hack,
We still have it more explicitly

checkstyle/.travis.yml

Line 45 in 104cf77

- sleep 5s

But unfortunately it was leaked to shell commands, as long time ago we run all on Travis and it was most powerful CI.