Update OSI submodule to version 3.6.0

[ClemensLinnhoff]

Reference to a related issue in the repository

#49

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Update OSI submodule to version 3.6.0

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@vkresch @jdsika

Check the checklist

• My code and comments follow the contributors guidelines of this project.
• I have performed a self-review of my own code.
• I have made corresponding changes to the documentation for osi-validation.
• My changes generate no new warnings.
• I have added tests that prove my fix is effective or that my feature works.
• New and existing unit tests / travis ci pass locally with my changes.

[vkresch]

Thanks for creating the PR but this needs to be checked with github actions pipeline implemented in #48 before we can merge this. The default rules and protobuf version might also to be updated.

[jdsika]

I think the installation failure on windows in #48 is due to the old OSI. Can't we merge this branch into the other PR?

Update: I have created #54