esp_prov.py: Replaced deprecated function for loading modules

tools/esp_prov/proto/__init__.py

@@ -13,17 +13,20 @@
 # limitations under the License.
 #
 
+import importlib.util
 import os
-
-
-def _load_source(name, path):
-    try:
-        from importlib.machinery import SourceFileLoader
-        return SourceFileLoader(name, path).load_module()
-    except ImportError:
-        # importlib.machinery doesn't exists in Python 2 so we will use imp (deprecated in Python 3)
-        import imp
-        return imp.load_source(name, path)
+import sys
+from importlib.abc import Loader
+from typing import Any
+
+
+def _load_source(name, path):  # type: (str, str) -> Any
+    spec = importlib.util.spec_from_file_location(name, path)
+    module = importlib.util.module_from_spec(spec)
+    sys.modules[spec.name] = module
+    assert isinstance(spec.loader, Loader)
+    spec.loader.exec_module(module)
+    return module
 
 
 idf_path = os.environ['IDF_PATH']