chore: Bump pytest from 8.2.2 to 8.3.1 in /code/python

Bumps [pytest](https://github.com/pytest-dev/pytest) from 8.2.2 to 8.3.1.
- [Release notes](https://github.com/pytest-dev/pytest/releases)
- [Changelog](https://github.com/pytest-dev/pytest/blob/main/CHANGELOG.rst)
- [Commits](pytest-dev/pytest@8.2.2...8.3.1)

---
updated-dependencies:
- dependency-name: pytest
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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

code/python/main-workshop/requirements-dev.txt

@@ -1 +1 @@
-pytest==8.2.2
+pytest==8.3.1

code/python/pipelines-workshop/requirements-dev.txt

@@ -1 +1 @@
-pytest==8.2.2
+pytest==8.3.1

code/python/tests-workshop/requirements-dev.txt

@@ -1 +1 @@
-pytest==8.2.2
+pytest==8.3.1