Bump grunt-banana-checker from 0.11.1 to 0.12.0 #355

Job	Run time
call-mediawiki-tests-workflow (master, 8.1, 81, false, true) / master \| PHP 8.1	7m 37s
call-mediawiki-tests-workflow (REL1_41, 8.1, 81, true, false) / REL1_41 \| PHP 8.1	5m 59s
notify-irc	23s
	13m 59s

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