Fix gosec, govet, and errorlint linter errors

Co-authored-by: Junie <junie@jetbrains.com>

internal/db/migrate.go

@@ -55,11 +55,11 @@ func Migrate(db *sql.DB) error {
 			return fmt.Errorf("db: begin migration %d: %w", version, err)
 		}
 		if _, err := tx.Exec(migrations[i]); err != nil {
-			tx.Rollback()
+			_ = tx.Rollback()
 			return fmt.Errorf("db: migration %d: %w", version, err)
 		}
 		if _, err := tx.Exec("INSERT INTO schema_migrations (version) VALUES (?)", version); err != nil {
-			tx.Rollback()
+			_ = tx.Rollback()
 			return fmt.Errorf("db: record migration %d: %w", version, err)
 		}
 		if err := tx.Commit(); err != nil {