chore: replace imp built-in module usage for future Python3.12 usage

`imp` module is deprecated in Python 3.4 and removed in Python3.12. This replacement will help with extending Superset support for Python3.12 in the future

Signed-off-by: hainenber <[email protected]>

tests/integration_tests/base_tests.py

@@ -18,7 +18,7 @@
 """Unit tests for Superset"""
 
 from datetime import datetime
-import imp
+import importlib.util
 from contextlib import contextmanager
 from typing import Any, Union, Optional
 from unittest.mock import Mock, patch, MagicMock
@@ -256,10 +256,10 @@ def get_table_by_id(table_id: int) -> SqlaTable:
         return db.session.query(SqlaTable).filter_by(id=table_id).one()
 
     @staticmethod
-    def is_module_installed(module_name):
+    def is_module_installed(module_name: str) -> bool:
         try:
-            imp.find_module(module_name)
-            return True
+            spec = importlib.util.find_spec(module_name)
+            return spec is not None
         except ImportError:
             return False