Update dalek, remove non-syn2 exemptions, tighten deps #3222

Job	Run time
docs	5m 21s
cargo-deny (advisories)	3m 16s
cargo-deny (bans licenses sources)	3m 10s
build-and-test (ubuntu-latest, x86_64-unknown-linux-gnu)	12m 26s
build-and-test (macos-latest, x86_64-apple-darwin)	24m 24s
build-and-test (macos-latest, aarch64-apple-darwin)	18m 14s
build-and-test (windows-latest, x86_64-pc-windows-msvc)	22m 44s
build-fuzz	2m 1s
fmt	11s
publish-dry-run	0s
rust-analyzer-compat	11m 44s
complete	1s
	1h 43m 32s

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