Add actor field to WorkflowRun

[46158n]

WorkflowRun does not have the actor field.
https://docs.github.com/en/rest/actions/workflow-runs#get-a-workflow-run

    "actor": {
      "title": "Simple User",
      "description": "Simple User",
      "type": "object",
      "properties": {
        "name": {
          "type": [
            "string",
            "null"
          ]
        },
        "email": {
          "type": [
            "string",
            "null"
          ]
        },
        "login": {
          "type": "string",
          "examples": [
            "octocat"
          ]
        },
        "id": {
          "type": "integer",
          "examples": [
            1
          ]
        },
        "node_id": {
          "type": "string",
          "examples": [
            "MDQ6VXNlcjE="
          ]
        },
        "avatar_url": {
          "type": "string",
          "format": "uri",
          "examples": [
            "https://github.com/images/error/octocat_happy.gif"
          ]
        },
        "gravatar_id": {
          "type": [
            "string",
            "null"
          ],
          "examples": [
            "41d064eb2195891e12d0413f63227ea7"
          ]
        },
        "url": {
          "type": "string",
          "format": "uri",
          "examples": [
            "https://api.github.com/users/octocat"
          ]
        },
        "html_url": {
          "type": "string",
          "format": "uri",
          "examples": [
            "https://github.com/octocat"
          ]
        },
        "followers_url": {
          "type": "string",
          "format": "uri",
          "examples": [
            "https://api.github.com/users/octocat/followers"
          ]
        },
        "following_url": {
          "type": "string",
          "examples": [
            "https://api.github.com/users/octocat/following{/other_user}"
          ]
        },
        "gists_url": {
          "type": "string",
          "examples": [
            "https://api.github.com/users/octocat/gists{/gist_id}"
          ]
        },
        "starred_url": {
          "type": "string",
          "examples": [
            "https://api.github.com/users/octocat/starred{/owner}{/repo}"
          ]
        },
        "subscriptions_url": {
          "type": "string",
          "format": "uri",
          "examples": [
            "https://api.github.com/users/octocat/subscriptions"
          ]
        },
        "organizations_url": {
          "type": "string",
          "format": "uri",
          "examples": [
            "https://api.github.com/users/octocat/orgs"
          ]
        },
        "repos_url": {
          "type": "string",
          "format": "uri",
          "examples": [
            "https://api.github.com/users/octocat/repos"
          ]
        },
        "events_url": {
          "type": "string",
          "examples": [
            "https://api.github.com/users/octocat/events{/privacy}"
          ]
        },
        "received_events_url": {
          "type": "string",
          "format": "uri",
          "examples": [
            "https://api.github.com/users/octocat/received_events"
          ]
        },
        "type": {
          "type": "string",
          "examples": [
            "User"
          ]
        },
        "site_admin": {
          "type": "boolean"
        },
        "starred_at": {
          "type": "string",
          "examples": [
            "\"2020-07-09T00:17:55Z\""
          ]
        }