Upgrade rust-musig2

Author: jirijakes

lightning/Cargo.toml

@@ -64,4 +64,4 @@ features = ["bitcoinconsensus", "secp-recovery"]
 criterion = { version = "0.4", optional = true, default-features = false }
 
 [target.'cfg(taproot)'.dependencies]
-musig2 = { git = "https://github.com/arik-so/rust-musig2", rev = "cff11e3" }
+musig2 = { git = "https://github.com/arik-so/rust-musig2", rev = "739533fc" }