Merge #1774: chore[chain,wallet]: fix build warnings

479117c chore(chain,wallet): fix build warnings (Steve Myers)

Pull request description:

  ### Description

  fixed #1773

  ### Notes to the reviewers

  I noticed these warnings while publishing beta.6 and would like to get them fixed before the final `bdk_wallet` 1.0.0. With default features we should have any build warnings. To reproduce:

  ```
  cargo build -p bdk_chain
  cargo build -p bdk_wallet
  ```

  ### Checklists

  #### All Submissions:

  * [x] I've signed all my commits
  * [x] I followed the [contribution guidelines](https://github.com/bitcoindevkit/bdk/blob/master/CONTRIBUTING.md)
  * [x] I ran `cargo fmt` and `cargo clippy` before committing

ACKs for top commit:
  ValuedMammal:
    ACK 479117c

Tree-SHA512: d9b18f0472ed3a3088c24f46b49361154dd568d95045bee6108a7f6ace84d0da19cfe1079b8549a5ba723e0ded9bca502f0ebf2d557ff4f23ac87ee51e6c335a

crates/chain/src/tx_graph.rs

@@ -460,7 +460,11 @@ impl<A: Clone + Ord> TxGraph<A> {
     ///
     /// The supplied closure returns an `Option<T>`, allowing the caller to map each node it visits
     /// and decide whether to visit descendants.
-    pub fn walk_descendants<'g, F, O>(&'g self, txid: Txid, walk_map: F) -> TxDescendants<A, F, O>
+    pub fn walk_descendants<'g, F, O>(
+        &'g self,
+        txid: Txid,
+        walk_map: F,
+    ) -> TxDescendants<'g, A, F, O>
     where
         F: FnMut(usize, Txid) -> Option<O> + 'g,
     {
@@ -477,7 +481,7 @@ impl<A> TxGraph<A> {
         &'g self,
         tx: &'g Transaction,
         walk_map: F,
-    ) -> TxDescendants<A, F, O>
+    ) -> TxDescendants<'g, A, F, O>
     where
         F: FnMut(usize, Txid) -> Option<O> + 'g,
     {
@@ -495,7 +499,7 @@ impl<A> TxGraph<A> {
     pub fn direct_conflicts<'g>(
         &'g self,
         tx: &'g Transaction,
-    ) -> impl Iterator<Item = (usize, Txid)> + '_ {
+    ) -> impl Iterator<Item = (usize, Txid)> + 'g {
         let txid = tx.compute_txid();
         tx.input
             .iter()

crates/wallet/src/wallet/changeset.rs

@@ -1,4 +1,3 @@
-use alloc::string::String;
 use bdk_chain::{
     indexed_tx_graph, keychain_txout, local_chain, tx_graph, ConfirmationBlockTime, Merge,
 };
@@ -73,7 +72,7 @@ impl ChangeSet {
     pub const WALLET_TABLE_NAME: &'static str = "bdk_wallet";
 
     /// Get v0 sqlite [ChangeSet] schema
-    pub fn schema_v0() -> String {
+    pub fn schema_v0() -> alloc::string::String {
         format!(
             "CREATE TABLE {} ( \
                 id INTEGER PRIMARY KEY NOT NULL CHECK (id = 0), \