STY: Apply ruff rule RUF017

RUF017 Avoid quadratic list summation

Author: DimitriPapadopoulos

nibabel/tests/test_volumeutils.py

@@ -607,7 +607,11 @@ def test_a2f_nanpos():
 
 def test_a2f_bad_scaling():
     # Test that pathological scalers raise an error
-    NUMERICAL_TYPES = sum((sctypes[key] for key in ['int', 'uint', 'float', 'complex']), [])
+    NUMERICAL_TYPES = [
+        x
+        for sublist in (sctypes[key] for key in ('int', 'uint', 'float', 'complex'))
+        for x in sublist
+    ]
     for in_type, out_type, slope, inter in itertools.product(
         NUMERICAL_TYPES,
         NUMERICAL_TYPES,

pyproject.toml

@@ -162,7 +162,6 @@ ignore = [
     "RUF005",
     "RUF012", # TODO: enable
     "RUF015",
-    "RUF017", # TODO: enable
     "UP027",  # deprecated
     "UP038",  # https://github.com/astral-sh/ruff/issues/7871
     # https://docs.astral.sh/ruff/formatter/#conflicting-lint-rules