Hotfix to add SCIP to main GH Action

[fletchapin]

Pull request recommendations:

• Name your pull request your-development-type/short-description. Ex: feature/gui
• Link to any relevant issue in the PR description. Ex: Resolves [ENH: Support optimization of flexibility metrics #12]
• Provide context of changes.
• Provide relevant tests for your feature or bug fix.
• Provide or update documentation for any feature added by your pull request.

Thanks for contributing!