Roll back hashbrown dependency to 0.16.

Wgpu doesn't specifically need 0.17, and Firefox would like to avoid
auditing 0.16 -> 0.17 for a little while longer.

Author: jimblandy

Cargo.lock

@@ -131,7 +131,7 @@ futures-lite = "2"
 glam = "0.32.0"
 glob = "0.3"
 half = { version = "2.5", default-features = false } # We require 2.5 to have `Arbitrary` support.
-hashbrown = { version = "0.17", default-features = false, features = [
+hashbrown = { version = "0.16", default-features = false, features = [
     "default-hasher",
     "inline-more",
 ] }