make coverage fail under 90

tox.ini

@@ -20,7 +20,7 @@ commands =
     ruff check --respect-gitignore --preview .
     ruff format --respect-gitignore --preview --check .
     mypy .
-    sh -c 'if [ $SKIP_ALL_TESTS = 1 ]; then echo "Skipping coverage report"; else pytest --cov=gso --cov-report=xml --cov-report=html --cov-fail-under=85 -n auto {posargs}; fi'
+    sh -c 'if [ $SKIP_ALL_TESTS = 1 ]; then echo "Skipping coverage report"; else pytest --cov=gso --cov-report=xml --cov-report=html --cov-fail-under=90 -n auto {posargs}; fi'
 
 allowlist_externals =
     sh