Update Firefox/Safari data for api.OffscreenCanvas.getContext.webgpu_context

[queengooborg]

This PR updates and corrects version values for Firefox and Safari for the getContext.webgpu_context member of the OffscreenCanvas API. The data comes from the mdn-bcd-collector project (v10.11.0).

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Tests Used: https://mdn-bcd-collector.gooborg.com/tests/api/OffscreenCanvas/getContext/webgpu_context

[github-actions[bot]]

This pull request has merge conflicts that must be resolved before it can be merged.

[queengooborg]

Hmm, in Safari, it seems like it is actually supported in worker contexts...? Possibly a case of early exposure?

[Elchi3]

Possibly accidental early expose on workers, yes. cc @jdatapple