Add IO Blender MTLX to landscape.yml

[jmertic]

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Pre-submission checklist:

Please check each of these after submitting your pull request:

• Are you including a repo_url? You need to pick the single best GitHub repository for your project, not a GitHub organization.
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• Is the project currently and actively maintained (e.g., accepts pull requests, replies to issues, has been tested against / builds properly with the compilers for this year's VFX platform)?
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