Bump com.puppycrawl.tools:checkstyle from 8.2 to 10.21.2 #949

Job	Run time
build (ubuntu-latest, 17, Client, false)	43s
build (ubuntu-latest, 17, Server, false)	38s
build (ubuntu-latest, 17, Core, false)	45s
build (ubuntu-latest, 17, External, false)	39s
build (ubuntu-latest, 17, Check-Updated-License-Files, false)	44s
build (ubuntu-latest, 17, Integration-Test, false)	49s
build (ubuntu-latest, 21, Client, false)	41s
build (ubuntu-latest, 21, Server, false)	40s
build (ubuntu-latest, 21, Core, false)	48s
build (ubuntu-latest, 21, External, false)	42s
build (ubuntu-latest, 21, Check-Updated-License-Files, false)	48s
build (ubuntu-latest, 21, Integration-Test, false)	39s
	8m 36s

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