chore(deps): update dependency pytest-cov to v6 (#1185)

requirements-test.txt

@@ -1,6 +1,6 @@
 pytest==8.3.3
 mock==5.1.0
-pytest-cov==5.0.0
+pytest-cov==6.0.0
 pytest-asyncio==0.24.0
 SQLAlchemy[asyncio]==2.0.36
 sqlalchemy-pytds==1.0.2