Bump pytest from 7.4.4 to 8.3.4 in /examples/python-*

Bumps [pytest](https://github.com/pytest-dev/pytest) from 7.4.4 to 8.3.4.
- [Release notes](https://github.com/pytest-dev/pytest/releases)
- [Changelog](https://github.com/pytest-dev/pytest/blob/main/CHANGELOG.rst)
- [Commits](pytest-dev/pytest@7.4.4...8.3.4)

---
updated-dependencies:
- dependency-name: pytest
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

examples/python-bazel/requirements.txt

@@ -1,3 +1,3 @@
 pytest == 7.0.1; python_version < '3.7'
 pytest == 7.4.4; python_version in '3.7'
-pytest == 8.3.3; python_version >= '3.8'
+pytest == 8.3.4; python_version >= '3.8'

examples/python-pytest/requirements.txt

@@ -1,3 +1,3 @@
 pytest == 7.0.1; python_version < '3.7'
 pytest == 7.4.4; python_version in '3.7'
-pytest == 8.3.3; python_version >= '3.8'
+pytest == 8.3.4; python_version >= '3.8'