chore: Run coverage with tox run-parallel

Author: edgarrmondragon

pyproject.toml

@@ -78,6 +78,7 @@ env_list = [
   "3.12",
   "3.13",
   "3.14",
+  "coverage",
   "lint",
   "typing",
 ]
@@ -157,6 +158,9 @@ package = [
   "*/site-packages/backoff/",
 ]
 
+[tool.ruff]
+line-length = 88
+
 [tool.coverage.report]
 fail_under = 100
 show_missing = true