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".

nursery/coin_select/src/coin_selector.rs

@@ -96,7 +96,7 @@ impl CoinSelectorOpt {
     ) -> Self {
         let mut tx = Transaction {
             input: vec![],
-            version: 1,
+            version: transaction::Version::ONE,
             lock_time: absolute::LockTime::ZERO,
             output: txouts.to_vec(),
         };
@@ -112,7 +112,7 @@ impl CoinSelectorOpt {
             target_value: if txouts.is_empty() {
                 None
             } else {
-                Some(txouts.iter().map(|txout| txout.value).sum())
+                Some(txouts.iter().map(|txout| txout.value.to_sat()).sum())
             },
             ..Self::from_weights(
                 base_weight.to_wu() as u32,

nursery/coin_select/src/lib.rs

@@ -12,7 +12,7 @@ use bdk_chain::{
     bitcoin,
     collections::{BTreeSet, HashMap},
 };
-use bitcoin::{absolute, Transaction, TxOut};
+use bitcoin::{absolute, transaction, Transaction, TxOut};
 use core::fmt::{Debug, Display};
 
 mod coin_selector;
@@ -29,5 +29,5 @@ pub const TXIN_BASE_WEIGHT: u32 = (32 + 4 + 4) * 4;
 // Shamelessly copied from
 // https://github.com/rust-bitcoin/rust-miniscript/blob/d5615acda1a7fdc4041a11c1736af139b8c7ebe8/src/util.rs#L8
 pub(crate) fn varint_size(v: usize) -> u32 {
-    bitcoin::VarInt(v as u64).len() as u32
+    bitcoin::VarInt(v as u64).size() as u32
 }