chore: bump x25519-dalek version to 2.0.0 (#359) #234

Job	Run time
test-windows	5m 46s
integration-tests (ubuntu-latest)	2m 7s
integration-tests (macos-latest)	1m 45s
check_features (ubuntu-latest)	42s
check_features (macos-latest)	4m 53s
rustfmt (ubuntu-latest)	7s
rustfmt (macos-latest)	1m 3s
clippy (ubuntu-latest)	47s
clippy (macos-latest)	1m 43s
tests (ubuntu-latest)	1m 49s
tests (macos-latest)	3m 7s
all-systems-go	1s
	23m 50s

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