Bump pytest from 7.4.3 to 9.0.3 in /python/example_code/bedrock-agent

Bumps [pytest](https://github.com/pytest-dev/pytest) from 7.4.3 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@7.4.3...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-agent/requirements.txt

@@ -8,7 +8,7 @@ iniconfig==2.0.0
 jmespath==1.0.1
 packaging==23.2
 pluggy==1.3.0
-pytest==7.4.3
+pytest==9.0.3
 python-dateutil==2.8.2
 PyYAML==6.0.1
 requests==2.33.0