Bump pytest from 9.0.2 to 9.0.3 in /Chapter03/reservation-service

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
...

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

Author: dependabot[bot]

Chapter03/reservation-service/pyproject.toml

@@ -11,7 +11,7 @@ dependencies = [
 
 [dependency-groups]
 dev = [
-    "pytest>=9.0.2",
+    "pytest>=9.0.3",
     "pytest-cov>=7.0.0",
     "ruff>=0.14.10",
     "ty>=0.0.9",