Bump ed25519-dalek to 2.1.1, ed25519-dalek-bip32 to 0.3.0

[kevinheavey]

Ported from anza-xyz/agave#3088

Summary of Changes

• Bump the two crate versions as in title and fix what breaks
• This involves one breaking change: Keypair::generate now relies on traits from a newer version of the rand crate - it no longer works with rand 0.7.

[seanyoung]

How does this affect performance (the bench should tell us that, I think).

[kevinheavey]

Looks like the new version is faster. Found this in the CI bench output https://github.com/anza-xyz/solana-sdk/actions/runs/13304474459/job/37152326064?pr=26:

test bench_ed25519_len_032 ... bench:      48,795.52 ns/iter (+/- 238.09)
test bench_ed25519_len_128 ... bench:      49,085.67 ns/iter (+/- 368.34)
test bench_ed25519_len_32k ... bench:     110,201.12 ns/iter (+/- 1,078.12)
test bench_ed25519_len_max ... bench:     171,307.76 ns/iter (+/- 1,212.43)

Meanwhile in another unrelated PR: https://github.com/anza-xyz/solana-sdk/actions/runs/13344518453/job/37273344074?pr=40

test bench_ed25519_len_032 ... bench:      62,532.14 ns/iter (+/- 1,077.31)
test bench_ed25519_len_128 ... bench:      62,774.78 ns/iter (+/- 597.11)
test bench_ed25519_len_32k ... bench:     123,763.83 ns/iter (+/- 1,565.07)
test bench_ed25519_len_max ... bench:     184,640.96 ns/iter (+/- 1,562.99)