MNT: Enforce ruff/Pyflakes rules (F)

Author: DimitriPapadopoulos

ruff.toml

@@ -32,7 +32,6 @@ extend-select = [
     "UP",
 ]
 ignore = [
-    "F",      # TODO: enable Pyflakes rules
     "C408",   # Unnecessary `dict()` call (rewrite as a literal)
     "PIE790", # Unnecessary `pass` statement
     "E241",   # Multiple spaces after comma
@@ -44,6 +43,10 @@ ignore = [
     "E721",   # TODO: Use `is` and `is not` for type comparisons, or `isinstance()` for isinstance check
     "E731",   # Do not assign a `lambda` expression, use a `def`
     "E741",   # Ambiguous variable name
+    "F403",   # `from ... import *` used; unable to detect undefined names
+    "F405",   # may be undefined, or defined from star imports
+    "F821",   # Undefined name
+    "F841",   # Local variable is assigned to but never used
     "UP015",  # Unnecessary mode argument
     "UP031",  # TODO: Use format specifiers instead of percent format
 ]