Upgrade miniscript/bitcoin dependency

Upgrade:

- bitcoin to v0.31.0
- miniscript to v11.0.0

Note: The bitcoin upgrade includes improvements to the
`Transaction::weight()` function, it appears those guys did good, we
no longer need to add the 2 additional weight units "just in case".

example-crates/example_esplora/src/main.rs

@@ -86,7 +86,7 @@ impl EsploraArgs {
             _ => panic!("unsupported network"),
         });
 
-        let client = esplora_client::Builder::new(esplora_url).build_blocking()?;
+        let client = esplora_client::Builder::new(esplora_url).build_blocking();
         Ok(client)
     }
 }