FIX: update estimate_file outputs to f string

Co-authored-by: Mathias Goncalves <[email protected]>

Author: mnoergaard

nipype/interfaces/freesurfer/model.py

@@ -521,7 +521,7 @@ def _list_outputs(self):
         if self.inputs.save_residual:
             outputs["error_file"] = os.path.join(glmdir, f"eres.{ext}")
         if self.inputs.save_estimate:
-            outputs["estimate_file"] = os.path.join(glmdir, "yhat.{ext}")
+            outputs["estimate_file"] = os.path.join(glmdir, f"yhat.{ext}")
         if any((self.inputs.mrtm1, self.inputs.mrtm2, self.inputs.logan)):
             outputs["bp_file"] = os.path.join(glmdir, f"bp.{ext}")
         if self.inputs.mrtm1: