gateway: upgrade harsh lib

[Terkwood]

API for harsh lib changed

error[E0308]: mismatched types
  --> src/compact_ids.rs:31:9
   |
30 |       pub fn decode(self) -> Option<Uuid> {
   |                              ------------ expected `std::option::Option<uuid::Uuid>` because of return type
31 | /         HARSH.decode(self.0).map(|xy| {
32 | |             let x = xy[0];
33 | |             let y = xy[1];
34 | |             let chunk_one = u64::to_be_bytes(x);
...  |
47 | |             Uuid::from_bytes(bytes)
48 | |         })
   | |__________^ expected enum `std::option::Option`, found enum `std::result::Result`
   |
   = note: expected enum `std::option::Option<uuid::Uuid>`
              found enum `std::result::Result<uuid::Uuid, harsh::harsh::HarshError>`