Chore(deps): Update pytest-cov requirement from <6 to <7

Updates the requirements on [pytest-cov](https://github.com/pytest-dev/pytest-cov) to permit the latest version.
- [Changelog](https://github.com/pytest-dev/pytest-cov/blob/master/CHANGELOG.rst)
- [Commits](pytest-dev/pytest-cov@v1.0...v6.0.0)

---
updated-dependencies:
- dependency-name: pytest-cov
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

pyproject.toml

@@ -81,7 +81,7 @@ optional-dependencies.test = [
   "polars[pyarrow]<1.13",
   "pytest<9",
   "pytest-asyncio<1",
-  "pytest-cov<6",
+  "pytest-cov<7",
   "sqlalchemy-cratedb",
 ]
 urls.changelog = "https://github.com/pyveci/sqlalchemy-postgresql-relaxed/blob/main/CHANGES.rst"