[MAINT] Change to use str.removesuffix (#1131)

clinica/pipelines/t1_linear/anat_linear_utils.py

@@ -32,9 +32,8 @@ def _get_substitutions_datasink(bids_image_id: str, suffix: str) -> list:
     substitutions : List of tuples of str
         List of length 3 containing the substitutions to perform.
     """
-    # TODO: Use str.removesuffix once Python 3.8 compatibility is dropped.
     if bids_image_id.endswith(f"_{suffix}"):
-        bids_image_id_without_suffix = bids_image_id[: -(len(suffix) + 1)]
+        bids_image_id_without_suffix = bids_image_id.removesuffix(f"_{suffix}")
     else:
         raise ValueError(
             f"bids image ID {bids_image_id} should end with provided {suffix}."