feat(landscape): add Cube Sandbox project

[fslongjin]

Add Cube Sandbox logo and entry under Workload Runtime subcategory

Cube Sandbox is a high-performance, out-of-the-box secure sandbox service built on RustVMM and KVM.

• Repository: https://github.com/TencentCloud/CubeSandbox
• Website: https://cubesandbox.com
• License: Apache License 2.0
• GitHub Stars: 5,617

Pre-submission checklist:

Please check each of these after submitting your pull request:

• Are you only including a repo_url if your project is 100% open source? If so, you need to pick the single best GitHub repository for your project, not a GitHub organization.
• Is your project closed source or, if it is open source, does your project have at least 300 GitHub stars?
• Have you picked the single best (existing) category for your project?
• Does it follow the other guidelines from the new entries section?
• Have you added your SVG to hosted_logos and referenced it there?
• Does your logo clearly state the name of the project/product and follow the other guidelines?
• Does your project/product name match the text on the logo?
• Have you verified that the Crunchbase data for your organization is correct (including headquarters and LinkedIn)?

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