[Schema Inaccuracy] repository variables permission missing from app-permissions

[jzinkweg]

Schema Inaccuracy

#/components/schemas/app-permissions
variables parameter is missing.

Expected

variables: write|read should be a valid parameter

Reproduction Steps

n/a

Created due to:
actions/create-github-app-token#231

[jzinkweg]

The same applies for organization_variables permissions.