Fix lint error

Signed-off-by: ddl-rliu <richard.liu@dominodatalab.com>

flytekit/core/interface.py

@@ -71,7 +71,7 @@ def __init__(
         if inputs:
             for k, v in inputs.items():
                 if not k.isidentifier():
-                    raise ValueError(f'Input name must be valid Python identifier: {k!r}')
+                    raise ValueError(f"Input name must be valid Python identifier: {k!r}")
                 if type(v) is tuple and len(cast(Tuple, v)) > 1:
                     self._inputs[k] = v  # type: ignore
                 else: