build: update piscina to 5.1.1 #1329

Job	Run time
list	1m 14s
workflow (devkit-core-tests)	1m 11s
workflow (build-unit-tests)	2m 3s
workflow (build-cli)	1m 28s
workflow (modules-builder-tests)	1m 40s
workflow (devkit-core-tests-rerun)	1m 14s
	8m 50s

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