wasmtime: Add exemption for duplicate hashbrown

Author: afonso360

deny.toml

@@ -40,3 +40,11 @@ skip-tree = [
     # version of `env_logger`, so ignore it.
     { name = "pretty_env_logger", depth = 20 },
 ]
+
+# This is intended to skip the no-duplicates deny rule. At the
+# moment it isn't feasable to not duplicate this while upgrading
+# some of our dependencies.
+# See #5550 for a slightly longer explanation
+[[bans.skip]]
+name = "hashbrown"
+version = "=0.12.3"