v1.17: SDK build error with nightly compiler due to pinned ahash version

[acheroncrypto]

Problem

agave/Cargo.toml

Line 135 in 4a70bc1

ahash = "=0.8.5"

This pinned version of ahash doesn't build with the nightly compiler (tkaitchuck/aHash#200):

error[E0635]: unknown feature `stdsimd`
  --> /home/x/.cargo/registry/src/index.crates.io-6f17d22bba15001f/ahash-0.8.5/src/lib.rs:99:42
   |
99 | #![cfg_attr(feature = "stdsimd", feature(stdsimd))]
   |                                          ^^^^^^^

However, it works with 1.18 crates because ahash version is not pinned:

agave/Cargo.toml

Line 140 in 7696b27

ahash = "0.8.7"

Proposed solution

Unpin ahash in the v1.17 branch.