lang: Fix use of unstable library feature 'build_hasher_simple_hash_one'

[acheroncrypto]

Problem

The new release of ahash uses build_hasher_simple_hash_one which was stabilized in 1.71 but the latest rustc version from the Solana tools is 1.68.0.

Compilation of solana-program crate doesn't work because of the version difference:

[dependencies]
solana-program = "1.17.13"

results in:

error[E0658]: use of unstable library feature 'build_hasher_simple_hash_one'
   --> src/random_state.rs:463:5
    |
463 | /     fn hash_one<T: Hash>(&self, x: T) -> u64 {
464 | |         RandomState::hash_one(self, x)
465 | |     }
    | |_____^
    |
    = note: see issue #86161 <https://github.com/rust-lang/rust/issues/86161> for more information
    = help: add `#![feature(build_hasher_simple_hash_one)]` to the crate attributes to enable

Summary of changes

Temporarily fixate ahash version to the latest compatible version until solana-labs/solana#33504 is resolved.

[vercel]

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