ci: update linter settings format for ruff

Fixes:
> warning: The top-level linter settings are deprecated in favour of
> their counterparts in the `lint` section`.

pyproject.toml

@@ -3,7 +3,7 @@ target-version = ["py37"]
 
 [tool.ruff]
 target-version = "py37"
-select = [
+lint.select = [
 	# pycodestyle
 	"E",
 	"W",
@@ -25,7 +25,7 @@ select = [
 	# flake8-simplify
 	"SIM",
 ]
-ignore = [
+lint.ignore = [
 	# Line too long.
 	# We have some places where it's just impossible to make it fit.
 	"E501",