fix: add compatibility layer to move to flask>=3

* flask-sqlalchemy moved pagination.

* this change has been added to have a smooth migration to flask>=3.0.0
  without creating a hard cut and major versions release.

invenio_jobs/services/results.py

@@ -1,6 +1,7 @@
 # -*- coding: utf-8 -*-
 #
 # Copyright (C) 2024 CERN.
+# Copyright (C) 2024 Graz University of Technology.
 #
 # Invenio-Jobs is free software; you can redistribute it and/or modify it
 # under the terms of the MIT License; see LICENSE file for more details.
@@ -9,13 +10,19 @@
 
 from collections.abc import Iterable, Sized
 
-from flask_sqlalchemy import Pagination
 from invenio_records_resources.services.records.results import (
     ExpandableField,
     RecordItem,
     RecordList,
 )
 
+try:
+    # flask_sqlalchemy<3.0.0
+    from flask_sqlalchemy import Pagination
+except ImportError:
+    # flask_sqlalchemy>=3.0.0
+    from flask_sqlalchemy.pagination import Pagination
+
 
 class Item(RecordItem):
     """Single item result."""