fix compiler warnings with GHC-9.10 #2611

Job	Run time
build (9.6, 3.12, ubuntu-20.04, true, +build-tool)	2m 22s
build (9.6, 3.12, ubuntu-22.04, true, +build-tool)	3m 12s
build (9.6, 3.12, macos-latest, true, +build-tool)	3m 50s
build (9.6, 3.12, macos-14, true, +build-tool)	4m 53s
build (9.10, 3.12, ubuntu-20.04, true, +build-tool)	15m 37s
build (9.10, 3.12, ubuntu-22.04, true, +build-tool)	15m 33s
build (9.10, 3.12, macos-latest, true, +build-tool)	17m 26s
build (9.10, 3.12, macos-14, true, +build-tool)	19m 12s
build (ubuntu-20.04, 9.6, 3.10, true, -build-tool)	2m 13s
Build and publish docker image	0s
	1h 24m 18s

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