pip(deps): bump optuna from 2.8.0 to 2.9.0 (#76)

Bumps [optuna](https://github.com/optuna/optuna) from 2.8.0 to 2.9.0.
- [Release notes](https://github.com/optuna/optuna/releases)
- [Commits](optuna/optuna@v2.8.0...v2.9.0)

---
updated-dependencies:
- dependency-name: optuna
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

requirements/TUNE_REQUIREMENTS.txt

@@ -1,4 +1,4 @@
-optuna==2.8.0
+optuna==2.9.0
 #torchvision
 #torch
 #ax-platform