ruff: Use older default ruleset from ruff 0.15

Adjusting to the new ruleset will be considerable work. Keep the original ruleset for now.

Fixes: #322

pyproject.toml

@@ -11,6 +11,13 @@ extend-exclude = [
     "versioneer.py",
 ]
 
+[tool.ruff.lint]
+# FIXME: This is the default rule set for ruff 0.15. From 0.16, a much larger default rule set
+# is used. We should gradually adjust code to satisfy the new checks (or define our own ruleset).
+# https://astral.sh/blog/ruff-v0.16.0#migrating-to-v016
+# https://forge.fedoraproject.org/quality/blockerbugs/issues/322
+select = ["E4", "E7", "E9", "F"]
+
 [tool.ruff.lint.isort]
 known-first-party = ["blockerbugs"]
 
@@ -51,4 +58,4 @@ ignore_missing_imports = true
 exclude = [
     "^blockerbugs/_version\\.py$",
     "^versioneer\\.py$",
-]
+]