Enable ruff rule flake8-bandit (S)

See: https://docs.astral.sh/ruff/rules/#flake8-bandit-s

Ignore warning about "asserts" which is not useful.

.ruff.toml

@@ -34,11 +34,12 @@ target-version = "py39"
 # Enable Pyflakes (`F`) and a subset of the pycodestyle (`E`)  codes by default.
 # Unlike Flake8, Ruff doesn't enable pycodestyle warnings (`W`) or
 # McCabe complexity (`C901`) by default.
-select = ["E4", "E7", "E9", "F", "I", "UP", "C4", "EXE", "SIM", "PERF"]
+select = ["E4", "E7", "E9", "F", "I", "UP", "S", "C4", "EXE", "SIM", "PERF"]
 ignore = [
     "E501",  # Line too long
     "E741",  # Ambiguous variable name: `l`
     "F403",  # `from .gmailieer import *` used; unable to detect undefined names
+    "S101",  # Use of `assert` detected
 ]
 
 # Allow fix for all enabled rules (when `--fix`) is provided.