[Schema Inaccuracy] Pull Request Simple labels.items.properties.description may be null

[bigfootjon]

Schema Inaccuracy
The Pull Request Simple object field labels.items.properties.description may be null, as the Pull Request object.

schemas:

incorrect

pull-request-simple:
type: object
title: Pull Request Simple
properties:
labels:
type: array
items:
properties:
description:
type: string

correct

pull-request:
type: object
title: Pull Request
properties:
labels:
type: array
items:
properties:
description:
type:
- string
- 'null'
Expected
change the repo field to oneof repository / type: null

Reproduction Steps
list pull request using curl -X GET https://api.github.com/repos/apache/pulsar/pulls?state=open

Related to yanyongyu/githubkit#7

[bigfootjon]

Previously filed as #1812

[nickfloyd]

@bigfootjon Thanks for submitting this again! I've routed this to the internal team that owns the endpoint so it can be addressed.