Introduce `--rust-edition` #2528

Job	Run time
msrv	1m 2s
minimal	19s
docs	29s
rustfmt-clippy	30s
check-cfg	21s
quickchecking	19s
test-book	8s
test (ubuntu-latest, 9.0, 1, 0, 0, 0, 0)	1m 42s
test-expectations (ubuntu-latest)	50s
test (ubuntu-latest, 9.0, 1, 0, 0, 1, 0)	2m 11s
test-expectations (macos-12)	1m 1s
test (ubuntu-latest, 9.0, 1, 0, 1, 0, 0)	1m 41s
test (ubuntu-latest, 9.0, 1, 0, 1, 1, 0)	2m 1s
test (ubuntu-latest, 9.0, 1, 1, 0, 0, 0)	2m 24s
test (ubuntu-latest, 9.0, 1, 1, 0, 1, 0)	2m 26s
test (ubuntu-latest, 9.0, 1, 1, 1, 0, 0)	2m 36s
test (ubuntu-latest, 9.0, 1, 1, 1, 1, 0)	2m 9s
test (ubuntu-latest, 16.0, 1, 0, 0, 0, 0)	3m 59s
test (ubuntu-latest, 16.0, 1, 0, 0, 1, 0)	4m 25s
test (ubuntu-latest, 16.0, 1, 0, 1, 0, 0)	4m 4s
test (ubuntu-latest, 16.0, 1, 0, 1, 1, 0)	3m 55s
test (ubuntu-latest, 16.0, 1, 1, 0, 0, 0)	4m 39s
test (ubuntu-latest, 16.0, 1, 1, 0, 1, 0)	4m 44s
test (ubuntu-latest, 16.0, 1, 1, 1, 0, 0)	5m 8s
test (ubuntu-latest, 16.0, 1, 1, 1, 1, 0)	5m 13s
test (ubuntu-latest, 16.0, 0, 0, 1)	2m 12s
test (macos-12, 9.0, 0, 0, 0)	1m 44s
success	1s
	1h 2m 13s

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