Upgrade to sqlx 0.7.2 (#736)

* Update to sqlx 0.7.2

* Somehow missed one (and remove queries from other branch)

src/auth/session.rs

@@ -112,7 +112,7 @@ pub async fn issue_session(
     .insert(transaction)
     .await?;
 
-    let session = DBSession::get_id(id, &mut *transaction, redis)
+    let session = DBSession::get_id(id, &mut **transaction, redis)
         .await?
         .ok_or_else(|| AuthenticationError::InvalidCredentials)?;