encryption: remove Ed25519/dalek entirely (no consumer, wrong SIMD substrate) #691

Job	Run time
neon-simd/parity-qemu	59s
wasm-simd/parity-node	50s
tier4-avx512-check	34s
format/stable	24s
Pass MSRV values to other jobs	4s
hpc-stream-parallel/rayon	1m 33s
native-backend/stable	8m 5s
clippy/1.95.0	45s
nostd/thumbv6m-none-eabi/stable	29s
miri	0s
cross_test/${{ matrix.target }}/${{ matrix.rust }}	0s
nightly-simd-polyfill	0s
cargo-careful	0s
docs/nightly	0s
blas-msrv	1m 4s
tests/stable	11m 17s
tests/beta	11m 14s
tests/1.95.0	11m 19s
conclusion	0s
	48m 37s

Provide feedback