Update uniffi dependencies to 0.21.0

Cargo.toml

@@ -16,8 +16,8 @@ name = "bdkffi"
 [dependencies]
 bdk = { version = "0.23", features = ["all-keys", "use-esplora-ureq", "sqlite-bundled"] }
 
-uniffi_macros = { version = "0.20.0", features = ["builtin-bindgen"] }
+uniffi_macros = { version = "0.21.0", features = ["builtin-bindgen"] }
-uniffi = { version = "0.20.0", features = ["builtin-bindgen"] }
+uniffi = { version = "0.21.0", features = ["builtin-bindgen"] }
 
 [build-dependencies]
-uniffi_build = { version = "0.20.0", features = ["builtin-bindgen"] }
+uniffi_build = { version = "0.21.0", features = ["builtin-bindgen"] }

bdk-ffi-bindgen/Cargo.toml

@@ -6,5 +6,5 @@ edition = "2021"
 [dependencies]
 anyhow = "1.0.45" # remove after upgrading to next version of uniffi
 structopt = "0.3"
-uniffi_bindgen = "0.20.0"
+uniffi_bindgen = "0.21.0"
 camino = "1.0.9"