Python: Bump pytest from 9.0.2 to 9.0.3 in /python/packages/lab (#5470)

* Bump pytest from 9.0.2 to 9.0.3 in /python/packages/lab

Bumps [pytest](https://github.com/pytest-dev/pytest) from 9.0.2 to 9.0.3.
- [Release notes](https://github.com/pytest-dev/pytest/releases)
- [Changelog](https://github.com/pytest-dev/pytest/blob/main/CHANGELOG.rst)
- [Commits](https://github.com/pytest-dev/pytest/compare/9.0.2...9.0.3)

---
updated-dependencies:
- dependency-name: pytest
  dependency-version: 9.0.3
  dependency-type: direct:development
...

Signed-off-by: dependabot[bot] <support@github.com>

* Update pytest from 9.0.2 to 9.0.3 across all workspace packages

Fix dependency conflict: agent-framework workspace packages were pinning
pytest==9.0.2 while agent-framework-lab required pytest==9.0.3, causing
uv dependency resolution to fail. Updated all pyproject.toml files and
regenerated uv.lock to use pytest==9.0.3 consistently.

Agent-Logs-Url: https://github.com/microsoft/agent-framework/sessions/d274f7c5-b5ed-4b18-8eab-4db3cfd9d1bf

Co-authored-by: moonbox3 <35585003+moonbox3@users.noreply.github.com>

---------

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: moonbox3 <35585003+moonbox3@users.noreply.github.com>

python/packages/lab/pyproject.toml

@@ -59,7 +59,7 @@ math = [
 dev = [
     "uv==0.11.3",
     "ruff==0.15.8",
-    "pytest==9.0.2",
+    "pytest==9.0.3",
     "mypy==1.20.0",
     "pyright==1.1.408",
     #tasks