Upgrade to bitcoin_hashes v0.11.0

New version of `bitcoin_hashes` is out, lets use it.

Author: tcharding

Cargo.toml

@@ -42,14 +42,14 @@ serde = { version = "1.0", default-features = false, optional = true }
 
 # You likely only want to enable these if you explicitly do not want to use "std", otherwise enable
 # the respective -std feature e.g., bitcoin-hashes-std
-bitcoin_hashes = { version = "0.10", default-features = false, optional = true }
+bitcoin_hashes = { version = "0.11", default-features = false, optional = true }
 rand = { version = "0.8", default-features = false, optional = true }
 
 [dev-dependencies]
 rand = "0.8"
 rand_core = "0.6"
 serde_test = "1.0"
-bitcoin_hashes = "0.10"
+bitcoin_hashes = "0.11"
 bincode = "1.3.3"
 
 # cbor does not build on WASM, we use it in a single trivial test (an example of when