update dashmap and hashbrown

[conradludgate]

Performance improved drastically for me on my M2 for the ThreadedRodeo.

Main changes:

1. Update hashbrown. The only change this caused is replacing raw_table() with raw_table_mut().
2. Update dashmap.
   • The raw-api of dashmap changed considerable. It now uses RawTable instead of HashMap to avoid double hashing.
3. Several lint fixes
   i. max_value() -> MAX.
   ii. Use the hash_one api stabalised in 1.71.0
4. Fix multi-threaded tests that were never enabled due to bad cfg.

Also includes #45
Fixes #46
Fixes #27