build(deps-dev): Update pytest-cov requirement (microsoft#871)

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@v4.0.0...v7.1.0)

---
updated-dependencies:
- dependency-name: pytest-cov
  dependency-version: 7.1.0
  dependency-type: direct:development
...

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Author: dependabot[bot]

packages/agent-hypervisor/pyproject.toml

@@ -55,7 +55,7 @@ full = [
 dev = [
     "pytest>=8.0.0,<9.0",
     "pytest-asyncio>=0.23.0,<1.0",
-    "pytest-cov>=4.0.0,<5.0",
+    "pytest-cov>=4.0.0,<8.0",
     "hypothesis>=6.0.0,<7.0",
     "ruff>=0.4.0,<1.0",
     "mypy>=1.8.0,<2.0",