Add flake8-bandit linting (#156)

The linter has been used in the past, so most assertions for these were
already there but needed to be updated to use `noqa: S` instead of
`nosec: B` annotations.

pyproject.toml

@@ -85,11 +85,15 @@ select = [
     "E", # pycodestyle errors
     "F", # pyflakes
     "I", # isort
+    "S", # flake8-bandit
     "W", # pycodestyle warnings
     "UP", # pyupgrade
 ]
 target-version = "py37"
 
+[tool.ruff.per-file-ignores]
+"tests/**/*.py" = ["S101"]
+
 [build-system]
 requires = ["poetry-core"]
 build-backend = "poetry.core.masonry.api"