Fix some clippy warnings

Author: weiznich

.github/workflows/ci.yml

@@ -100,7 +100,7 @@ jobs:
           echo "DATABASE_URL=/tmp/test.db" >> $GITHUB_ENV
 
       - name: Install postgres (MacOS)
-        if: matrix.os == 'macos-latest' && matrix.backend == 'postgres'
+        if: matrix.os == 'macos-13' && matrix.backend == 'postgres'
         run: |
           initdb -D /usr/local/var/postgres
           pg_ctl -D /usr/local/var/postgres start
@@ -123,7 +123,7 @@ jobs:
           echo "DATABASE_URL=/tmp/test.db" >> $GITHUB_ENV
 
       - name: Install mysql (MacOS)
-        if: matrix.os == 'macos-latest' && matrix.backend == 'mysql'
+        if: matrix.os == 'macos-13' && matrix.backend == 'mysql'
         run: |
           brew install mariadb@11.3
           /usr/local/opt/mariadb@11.3/bin/mysql_install_db

examples/sync-wrapper/src/main.rs

@@ -14,6 +14,7 @@ table! {
     }
 }
 
+#[allow(dead_code)]
 #[derive(Debug, Queryable, Selectable)]
 #[diesel(table_name = users)]
 struct User {

src/sync_connection_wrapper.rs

@@ -134,10 +134,7 @@ where
         .boxed()
     }
 
-    fn execute_returning_count<'conn, 'query, T>(
-        &'conn mut self,
-        source: T,
-    ) -> Self::ExecuteFuture<'conn, 'query>
+    fn execute_returning_count<'query, T>(&mut self, source: T) -> Self::ExecuteFuture<'_, 'query>
     where
         T: QueryFragment<Self::Backend> + QueryId,
     {