Update knockout to 3.5.1

[mramato]

This is just a maintenance update with no changes required on our end.

[cesium-concierge]

Thanks for the pull request @mramato!

• ✔️ Signed CLA found.
• ❔ Changes to third party files were made.
  • Looks like a file in one of our ThirdParty folders (ThirdParty/, Source/ThirdParty/) has been added or modified. Please verify that it has a section in LICENSE.md and that its license information is up to date with this new version.
• ❔ Unit tests were not updated.
  • Make sure you've updated tests to reflect your changes, added tests for any new code, and ran the code coverage tool.

Reviewers, don't forget to make sure that:

• Cesium Viewer works.
• Works in 2D/CV.
• Works (or fails gracefully) in IE11.

[mramato]

Node seems to be having an issue, I'll bump when ready.

[cesium-concierge]

Thanks again for your contribution @mramato!

No one has commented on this pull request in 30 days. Maintainers, can you review, merge or close to keep things tidy?

I'm going to re-bump this in 30 days. If you'd like me to stop, just comment with @cesium-concierge stop. If you want me to start again, just delete the comment.

[hpinkos]

Thanks @mramato, this change looks good to me. There was a weird CI failure so I just restarted it to see if it was an actual problem

[hpinkos]

@mramato yeah, can you look at the CI failure here?

[mramato]

@hpinkos only took 4 weeks, but this is ready 😄

[hpinkos]

👍