Update Actions versions

[Irratzo]

Describe the issue:

In my best-of list best-of-atomistic-machine-learning, recently the workflow update-best-of-list started in step create-update-branch with error Error: HttpError: Branch not found. Also, the corresponding actions, used there, actions/checkout and peterjgrainger/action-create-branch threw version deprecation warnings.

I fixed both by updating these action's versions in the update-best-of-list.yml.

• actions/checkout@v2 --> actions/checkout@v4
• peterjgrainger/action-create-branch@v2.0.1 --> peterjgrainger/action-create-branch@v3.0.0

Thank you for updating this here, or in the best-of-generator template, too. I don't know whether and how this should actually work, such that all lists generated with the template can pull the fix from upstream. But that would be nice.