chore(deps): update dependency pytest-cov to v6

pyproject.toml

@@ -99,7 +99,7 @@ pre-commit = [
 ]
 pytest = ">=7.1.3,<9.0.0"
 pytest-clarity = "^1.0.1"
-pytest-cov = ">=3,<6"
+pytest-cov = ">=6,<7"
 pytest-console-scripts = "^1.3.1"
 pytest-xdist = ">=2.5,<4.0"
 pytest-plt = "^1.1.0"