Update hashbrown requirement from 0.16.1 to 0.17.1

[kfc35]

Objective

• Adopts Update hashbrown requirement from 0.16.1 to 0.17.1 #24661

Solution

• The breakage is due to a change in 0.17.0:

Changed EntryRef to use ToOwned (#670)

In the places we use EntryRef, I expanded the entry_ref call to a match stmt and used insert_with_key as reported by another person rust-lang/hashbrown#711 (comment) . I .into()’d the key refs to cast them into Box’s

• There are no other breaking changes between 0.16.1 -> 0.17.1

Testing

• ci