chore(deps-dev): bump pytest from 9.0.2 to 9.0.3 in /tools/spanner (#2221)

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](pytest-dev/pytest@9.0.2...9.0.3)

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

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

tools/spanner/poetry.lock

@@ -18,7 +18,7 @@ protobuf = ">=5.29,<7.0.0"
 statsd = "^4.0.1"
 
 [tool.poetry.group.dev.dependencies]
-pytest = "^9.0.2"
+pytest = "^9.0.3"
 mypy = "^1.19.1"
 pydocstyle = "^6.3.0"
 ruff = "^0.15.6"