[BUG][JAVA][SPRING] @RequestBody & application/x-www-form-urlencoded give 415 Unsupported Media Type

Bug Report Checklist

• Have you provided a full/minimal spec to reproduce the issue?
• Have you validated the input using an OpenAPI validator (example)?
• Have you tested with the latest master to confirm the issue still exists?
• Have you searched for related issues/PRs?
• What's the actual output vs expected output?
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Description

It's seems that Spring doesn't understand it as a RequestBody when using application/x-www-form-urlencoded
A quick workaround is to override the bodyParams.mustache and remove the @RequestBody in it, for my case it was enough
(by the way, this override possibility is just a fantastic idea)
There is no specific generation problem, neither start one, but when I call the API I get a 415 - Unsupported Media Type

I tried to correct this thing to PR but I can't figure how, on what param should I lean to set up this @RequestBody (or ot) ?

openapi-generator version

5.2.1

OpenAPI declaration file content or url

(quick extract may be no correctly indent)

openapi: 3.0.0
paths:
  /insert:
    post:
      summary: ''
      operationId: post-insert
      responses:
        '200':
          description: OK
          content:
            application/json: [...]
      requestBody:
        $ref: '#/components/requestBodies/DataBody'
components:
  requestBodies:
    DataBody:
      description: ''
      required: true
      content:
        application/x-www-form-urlencoded:
          schema:
            $ref: '#/components/schemas/Data'
  schemas:
    Data:
      title: Data
      type: object
      properties:
        DATA:
          type: string
          format: byte

Generation Details

generatorName: spring
library: spring-boot
No generation problem

Steps to reproduce

Create spring app with it

Start with the Spring generator's bodyParams.mustache and reproduce the provided OpenAPI example using application/x-www-form-urlencoded. Check how the generated @RequestBody parameter is handled, then verify the generated Spring application no longer returns 415 Unsupported Media Type for this request.