build(deps): bump the test-dependencies group with 2 updates

Bumps the test-dependencies group with 2 updates: [pytest](https://github.com/pytest-dev/pytest) and [pytest-cov](https://github.com/pytest-dev/pytest-cov).


Updates `pytest` from 8.4.1 to 8.4.2
- [Release notes](https://github.com/pytest-dev/pytest/releases)
- [Changelog](https://github.com/pytest-dev/pytest/blob/main/CHANGELOG.rst)
- [Commits](pytest-dev/pytest@8.4.1...8.4.2)

Updates `pytest-cov` from 6.2.1 to 6.3.0
- [Changelog](https://github.com/pytest-dev/pytest-cov/blob/master/CHANGELOG.rst)
- [Commits](pytest-dev/pytest-cov@v6.2.1...v6.3.0)

---
updated-dependencies:
- dependency-name: pytest
  dependency-version: 8.4.2
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: test-dependencies
- dependency-name: pytest-cov
  dependency-version: 6.3.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: test-dependencies
...

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

Author: dependabot[bot]

pyproject.toml

@@ -36,10 +36,10 @@ pyvistaqt = [
     "pyvistaqt >= 0.11.1,<1",
 ]
 tests = [
-    "pytest==8.4.1",
+    "pytest==8.4.2",
     "pyvista==0.46.3",
     "pytest-pyvista==0.2.0",
-    "pytest-cov==6.2.1",
+    "pytest-cov==6.3.0",
     "pyside6==6.9.2",
 ]