False positive diff change when `example` used

[cinnes]

openapi-diff will incorrectly report a diff between two specs if example is used. Here's an example:

openapi: 3.0.1
info:
  title: My API
  version: 1.0.0
paths:
  /api/v1/csv:
    get:
      operationId: someCsvEndpoint
      responses:
        "200":
          content:
            text/csv:
              schema:
                type: string
                format: binary
                example: Example
          description: Successful operation
      security:
      - Bearer: []
      summary: Download a CSV or something
components:
  securitySchemes:
    Bearer:
      bearerFormat: JWT
      scheme: bearer
      type: http

Then:

➜ docker run --rm -it \
  -v "$(pwd):/specs" \
  openapitools/openapi-diff:2.1.2 \
  /specs/myspec.yaml /specs/myspec.yaml
==========================================================================
==                            API CHANGE LOG                            ==
==========================================================================
                                  My API
--------------------------------------------------------------------------
--                            What's Changed                            --
--------------------------------------------------------------------------
- GET    /api/v1/csv
  Return Type:
    - Changed 200 OK
      Media types:
        - Changed text/csv
          Schema: Backward compatible
--------------------------------------------------------------------------
--                                Result                                --
--------------------------------------------------------------------------
                   API changes are backward compatible
--------------------------------------------------------------------------

Comparing it against itself detects a change. Removing example entirely:

openapi: 3.0.1
info:
  title: My API
  version: 1.0.0
paths:
  /api/v1/csv:
    get:
      operationId: someCsvEndpoint
      responses:
        "200":
          content:
            text/csv:
              schema:
                type: string
                format: binary
          description: Successful operation
      security:
      - Bearer: []
      summary: Download a CSV or something
components:
  securitySchemes:
    Bearer:
      bearerFormat: JWT
      scheme: bearer
      type: http

and...

➜ docker run --rm -it \
  -v "$(pwd):/specs" \
  openapitools/openapi-diff:2.1.2 \
  /specs/myspec.yaml /specs/myspec.yaml
No differences. Specifications are equivalents