Apply ruff rule RUF013

RUF013 PEP 484 prohibits implicit `Optional`

Author: DimitriPapadopoulos

fmriprep/workflows/bold/base.py

@@ -55,7 +55,7 @@
 def init_bold_wf(
     *,
     bold_series: list[str],
-    precomputed: dict = None,
+    precomputed: dict | None = None,
     fieldmap_id: str | None = None,
 ) -> pe.Workflow:
     """

fmriprep/workflows/bold/fit.py

@@ -95,7 +95,7 @@ def get_sbrefs(
 def init_bold_fit_wf(
     *,
     bold_series: list[str],
-    precomputed: dict = None,
+    precomputed: dict | None = None,
     fieldmap_id: str | None = None,
     omp_nthreads: int = 1,
     name: str = 'bold_fit_wf',

fmriprep/workflows/tests/test_base.py

@@ -117,8 +117,8 @@ def _make_params(
     use_syn_sdc: str | bool = False,
     force_syn: bool = False,
     freesurfer: bool = True,
-    ignore: list[str] = None,
-    bids_filters: dict = None,
+    ignore: list[str] | None = None,
+    bids_filters: dict | None = None,
 ):
     if ignore is None:
         ignore = []