fix(tests): sqlalchemy.exc.ArgumentError

* Textual SQL expression 'SELECT setval(pg_get_seri...' should be
  explicitly declared as text('SELECT setval(pg_get_seri...')

* unclear why this doesn't popped up before. it should have!

Author: utnapischtim

invenio_pidstore/models.py

@@ -18,7 +18,7 @@
 import six
 from invenio_db import db
 from invenio_i18n import lazy_gettext as _
-from sqlalchemy import func
+from sqlalchemy import func, text
 from sqlalchemy.exc import IntegrityError, SQLAlchemyError
 from sqlalchemy.orm.exc import NoResultFound
 from sqlalchemy_utils.types import ChoiceType, UUIDType
@@ -608,8 +608,9 @@ def _set_sequence(cls, val):
         """
         if db.engine.dialect.name == "postgresql":  # pragma: no cover
             db.session.execute(
-                "SELECT setval(pg_get_serial_sequence("
-                "'{0}', 'recid'), :newval)".format(cls.__tablename__),
+                text(
+                    f"SELECT setval(pg_get_serial_sequence('{cls.__tablename__}', 'recid'), :newval)"
+                ),
                 dict(newval=val),
             )