Fix database backward migration

Author: GuillaumeGomez

src/db/migrate.rs

@@ -710,9 +710,15 @@ pub fn migrate(version: Option<Version>, conn: &mut Client) -> CratesfyiResult<(
                     FROM repositories WHERE repositories.host = 'github.com';
 
                 UPDATE releases
-                    SET github_repo = repositories.host_id
-                FROM repositories
-                WHERE repositories.host_id = releases.github_repo AND releases.repository_id IS NOT NULL AND repositories.host = 'github.com';
+                    SET github_repo = (
+                        SELECT host_id
+                        FROM repositories
+                        WHERE
+                            repositories.host = 'github.com' AND
+                            repositories.id = releases.repository_id
+                    )
+                WHERE
+                    repository_id IS NOT NULL;
 
                 DROP INDEX releases_github_repo_idx;
                 DROP INDEX github_repos_stars_idx;