Deactivate many `regex` Unicode crate features #1827

Job	Run time
rustfmt-clippy	28s
msrv	2m 21s
docs	20s
check-cfg	21s
quickchecking	14s
test-book	5s
test-expectations (ubuntu-latest)	58s
test (ubuntu-latest, 5.0, 1, 0, 0, 0, 0)	1m 42s
test-expectations (macos-latest)	1m 44s
test (ubuntu-latest, 5.0, 1, 0, 0, 1, 0)	1m 38s
test (ubuntu-latest, 5.0, 1, 0, 1, 0, 0)	1m 41s
test (ubuntu-latest, 5.0, 1, 0, 1, 1, 0)	1m 36s
test (ubuntu-latest, 5.0, 1, 1, 0, 0, 0)	2m 3s
test (ubuntu-latest, 5.0, 1, 1, 0, 1, 0)	1m 59s
test (ubuntu-latest, 5.0, 1, 1, 1, 0, 0)	2m 11s
test (ubuntu-latest, 5.0, 1, 1, 1, 1, 0)	3m 0s
test (ubuntu-latest, 9.0, 1, 0, 0, 0, 0)	1m 47s
test (ubuntu-latest, 9.0, 1, 0, 0, 1, 0)	1m 51s
test (ubuntu-latest, 9.0, 1, 0, 1, 0, 0)	1m 53s
minimal	9s
test (ubuntu-latest, 9.0, 1, 0, 1, 1, 0)	1m 48s
test (ubuntu-latest, 9.0, 1, 1, 0, 0, 0)	2m 35s
test (ubuntu-latest, 9.0, 1, 1, 0, 1, 0)	2m 13s
test (ubuntu-latest, 9.0, 1, 1, 1, 0, 0)	2m 19s
test (ubuntu-latest, 9.0, 1, 1, 1, 1, 0)	2m 30s
test (ubuntu-latest, 9.0, 0, 0, 1)	1m 6s
test (macos-latest, 9.0, 0, 0, 0)	1m 26s
	41m 58s

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