Convert integer values to float in value_as_float() function (#1773)

* models.py

Variables can sometimes be of type integer, which generates an error line 334

* Modify function to always return a float

---------

Co-authored-by: Mick Vleeshouwer <mick@imick.nl>

Author: Yvan13120

pyoverkiz/models.py

@@ -331,6 +331,8 @@ def value_as_float(self) -> float | None:
             return None
         if self.type == DataType.FLOAT:
             return cast(float, self.value)
+        if self.type == DataType.INTEGER:
+            return float(cast(int, self.value))
         raise TypeError(f"{self.name} is not a float")
 
     @property