Update all benchmarks in miden-crypto that were using RPO

After the migration from RPO to Poseidon2 as the native hash function for Miden VM, many of the benchmarks in miden-crypto are now obsolete. We should re-run the benchmarks and update these.

_Originally posted by @bobbinth in https://github.com/0xMiden/crypto/pull/793#discussion_r2726444077_

Look for benchmark files in the miden-crypto crate, likely under a benches/ directory. Identify benchmarks that still reference RPO. Update them to use Poseidon2, then run the benchmarks with cargo bench to ensure they work and produce updated results. Check the linked PR #793 for context on the migration.

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