Adding computed_field output type.

Author: rhysrevans3

stac_fastapi/core/stac_fastapi/core/models/patch.py

@@ -31,5 +31,5 @@ def __init__(self, *, path: str):
 
     @computed_field
     @property
-    def location(self):
+    def location(self) -> str:
         return self.nest + self.partition + self.key