Required parameters are not marked as required

Description

The token, channel and ts parameters are shown as required in the documentation for the chat.delete method : https://api.slack.com/methods/chat.delete#arg_token

However, in slack_web_openapi_v2.json , the parameter definitions lack the "required": true annotation.

The same issue exists in other 46 other methods, as far as I can see. These include, among others: chat.meMessage, chat.scheduleMessage, chat.scheduleMessages_list

What type of issue is this? (place an `x` in one of the `[ ]`)

[x] bug
[ ] enhancement (feature request)
[ ] question
[ ] documentation related
[ ] testing related
[ ] discussion

Requirements (place an `x` in each of the `[ ]`)

[x] I've read and understood the Contributing guidelines and have done my best effort to follow them.
[x] I've read and agree to the Code of Conduct.
[x] I've searched for any related issues and avoided creating a duplicate issue.

Bug Report

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Reproducible in:

All environments

Steps to reproduce:

Inspect and compare the method documentation and the openapi schema for the above methods

Expected result:

All parameters documented as required should be marked as "required": true in the schema files

Actual result:

Some methods in the schema do not have the "required":true annotation.

Attachments:

"/chat.delete": {
            "post": {
                "consumes": [
                    "application/x-www-form-urlencoded",
                    "application/json"
                ],
                "description": "Deletes a message.",
                "externalDocs": {
                    "description": "API method documentation",
                    "url": "https://api.slack.com/methods/chat.delete"
                },
                "operationId": "chat_delete",
                "parameters": [
                    {
                        "description": "Authentication token. Requires scope: `chat:write`",
                        "in": "header",
                        "name": "token",
                        "type": "string"
                    },
                    {
                        "description": "Timestamp of the message to be deleted.",
                        "in": "formData",
                        "name": "ts",
                        "type": "number"
                    },
                    {
                        "description": "Channel containing the message to be deleted.",
                        "in": "formData",
                        "name": "channel",
                        "type": "string"
                    },
                    {
                        "description": "Pass true to delete the message as the authed user with `chat:write:user` scope. [Bot users](/bot-users) in this context are considered authed users. If unused or false, the message will be deleted with `chat:write:bot` scope.",
                        "in": "formData",
                        "name": "as_user",
                        "type": "boolean"
                    }
                ],
...............

slackapi / slack-api-specs