Bump tokio version to 1.37

.. as we use `Clone` for `tokio::sync::watch::Sender`, which was only
introduced with 1.37.

Author: tnull

Cargo.toml

@@ -64,7 +64,7 @@ bip39 = "2.0.0"
 
 rand = "0.8.5"
 chrono = { version = "0.4", default-features = false, features = ["clock"] }
-tokio = { version = "1", default-features = false, features = [ "rt-multi-thread", "time", "sync" ] }
+tokio = { version = "1.37", default-features = false, features = [ "rt-multi-thread", "time", "sync" ] }
 esplora-client = { version = "0.6", default-features = false }
 libc = "0.2"
 uniffi = { version = "0.26.0", features = ["build"], optional = true }