ruff: Configure hacking as external linter

Change-Id: I76b1a8de335e855a28aa16e3d345b3d345c590e1
Signed-off-by: Stephen Finucane <stephenfin@redhat.com>

pyproject.toml

@@ -41,8 +41,8 @@ python_version = "3.10"
 show_column_numbers = true
 show_error_context = true
 strict = true
-exclude = '(?x)(doc | examples | releasenotes)'
 disable_error_code = ["import-untyped"]
+exclude = "(?x)(doc | releasenotes)"
 
 [[tool.mypy.overrides]]
 module = ["oslo_upgradecheck.tests.*"]
@@ -56,6 +56,7 @@ line-length = 79
 
 [tool.ruff.lint]
 select = ["C4", "E4", "E5", "E7", "E9", "F", "G", "LOG", "S", "UP"]
+external = ["H"]
 ignore = [
     # we only use asserts for type narrowing
     "S101",