fix: revert to old-style annotations to support <Py310 (x5)

src/fate/conf/types/task.py

@@ -202,7 +202,7 @@ def scheduling_(self):
 
     @at_depth(0)
     @property
-    def exec_(self) -> tuple[str]:
+    def exec_(self) -> typing.Tuple[str]:
         # check for superfluous/conflicting argumentation
         keys = ('exec', 'shell', 'command')
         if sum(key in self for key in keys) > 1: