fix: deprecated decorator wasn't returning the value of the moved cal…

…lable.

Signed-off-by: Victor Garcia Reolid <victor@seita.nl>

flexmeasures/utils/coding_utils.py

@@ -166,7 +166,7 @@ def wrapper(*args, **kwargs):
                 f"The method or function {func.__name__} is deprecated and it is expected to be sunset in version {version}. Please, switch to using {inspect.getmodule(alternative).__name__}:{alternative.__name__} to suppress this warning."
             )
 
-            func(*args, **kwargs)
+            return func(*args, **kwargs)
 
         return wrapper