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Use cbor2pure by default #1593

Job	Run time
continuous-integration (ubuntu-latest, 3.11)	5m 28s
build (ubuntu-latest, 3.11)	54s
build (macos-latest, 3.12)	32s
build (ubuntu-latest, 3.12)	35s
build (macos-latest, 3.11)	2m 33s
build (ubuntu-latest, 3.13)	42s
build (ubuntu-latest, 3.9)	39s
build (macos-latest, 3.9)	1m 7s
build (ubuntu-latest, 3.10)	39s
build (macos-latest, 3.10)	1m 13s
build (macos-latest, 3.13)	38s
	15m 0s

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