Bump pytest from 8.4.2 to 9.0.3 in /python/example_code/bedrock-runtime

Bumps [pytest](https://github.com/pytest-dev/pytest) from 8.4.2 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@8.4.2...9.0.3)

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

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

Author: dependabot[bot]

python/example_code/bedrock-runtime/requirements.txt

@@ -6,7 +6,7 @@ jmespath==1.0.1
 packaging==24.2
 pluggy==1.5.0
 Pygments==2.20.0
-pytest==8.4.2
+pytest==9.0.3
 python-dateutil==2.9.0.post0
 s3transfer==0.14.0
 six==1.17.0