Upgrade to edition 2021. (#1217) #2734

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Job	Run time
softhsm2-test (1.70.0, hsm,hsm-tests-pkcs11)	5m 34s
pykmip-test (1.70.0, hsm)	5m 54s
softhsm2-test (stable, hsm,hsm-tests-pkcs11)	4m 52s
build (ubuntu-latest, 1.70.0, --no-default-features)	7m 18s
pykmip-test (1.70.0, hsm,hsm-tests-kmip)	6m 23s
softhsm2-test (beta, hsm,hsm-tests-pkcs11)	5m 4s
build (ubuntu-latest, 1.70.0)	9m 5s
pykmip-test (stable, hsm)	5m 17s
build (ubuntu-latest, 1.70.0, --features all)	8m 37s
pykmip-test (stable, hsm,hsm-tests-kmip)	5m 40s
build (ubuntu-latest, stable, --no-default-features)	7m 51s
pykmip-test (beta, hsm)	5m 20s
build (ubuntu-latest, stable)	8m 11s
pykmip-test (beta, hsm,hsm-tests-kmip)	5m 31s
build (ubuntu-latest, stable, --features all)	9m 4s
build (ubuntu-latest, beta, --no-default-features)	6m 28s
build (ubuntu-latest, beta)	8m 11s
build (ubuntu-latest, beta, --features all)	7m 47s
	2h 2m 7s

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