Delete "table" in schema "github-action.json"

Description of the JSON schema.

Here's the English translation of the given sentences:
If you look at the "Exhaustive list of all currently supported icon" section on the GitHub Action page,
the "table" does not exist.
However, if you look at

schemastore/src/schemas/json/github-action.json

Line 616 in 1274ec4

"table",

, the "table" exists.
It seems that the value should be deleted.

Supporting information.

https://docs.github.com/en/actions/creating-actions/metadata-syntax-for-github-actions#exhaustive-list-of-all-currently-supported-icons

Are you making a PR for this?

Yes, I will create a PR.