add hashbrown

Signed-off-by: kernelkind <kernelkind@gmail.com>

crates/notedeck/Cargo.toml

@@ -38,6 +38,7 @@ tokio = { workspace = true }
 bech32 = { workspace = true }
 lightning-invoice = { workspace = true }
 secp256k1 = { workspace = true }
+hashbrown = { workspace = true }
 
 [dev-dependencies]
 tempfile = { workspace = true }