[BUG] Openapi feign client generation body/query param mismatch

Bug Report Checklist

• [ x] Have you provided a full/minimal spec to reproduce the issue?
• [ x] Have you validated the input using an OpenAPI validator (example)?
• [ x] Have you tested with the latest master to confirm the issue still exists?
• [x ] Have you searched for related issues/PRs?
• [x ] What's the actual output vs expected output?
• [Optional] Sponsorship to speed up the bug fix or feature request (example)

Description

Given this example specification describing the request body as a form model and the generated feign api interface.
The actual behaviour is that the feign client sends the parameters as query params not in the the body.
The fix for this is that the params should be wrapped in a form model dto and specified in the generated code as
RequestBody

eg

ResponseEntity<Void> authenticationServiceAuthorizePost(
        @Parameter(name = "Content-Type", description = "") @RequestHeader(value = "Content-Type", required = false) String contentType,
     @RequestBody AuthRequestDto authRequestDto
 
...more params generated...
    );

/authentication-service/authorize:
  post:
    tags:
      - Auth
    summary: Authorize
    requestBody:
      content:
        application/x-www-form-urlencoded:
          schema:
            properties:
              redirect_uri:
                type: string
                example: http://localhost
              client_id:
                type: string
                example: asdf
          encoding:
            redirect_uri:
              allowReserved: true
            client_id:
              allowReserved: true
    parameters:
      - name: Content-Type
        in: header
        schema:
          type: string
        example: application/x-www-form-urlencoded
    responses:
      '200':
        description: Successful response
        content:
          application/json: {}

@Operation(
        operationId = "authenticationServiceAuthorizeGet",
        summary = "API-AS02 Authorize",
        tags = { "Auth" },
        responses = {
            @ApiResponse(responseCode = "200", description = "Successful response")
        }
    )
    @RequestMapping(
        method = RequestMethod.GET,
        value = "/authentication-service/authorize",
        produces = "application/json",
        consumes = "application/x-www-form-urlencoded"
    )
    ResponseEntity<Void> authenticationServiceAuthorizePost(
        @Parameter(name = "Content-Type", description = "") @RequestHeader(value = "Content-Type", required = false) String contentType,
        @Parameter(name = "redirect_uri", description = "") @Valid @RequestParam(value = "redirect_uri", required = false) String redirectUri,
        @Parameter(name = "client_id", description = "") @Valid @RequestParam(value = "client_id", required = false) String clientId,
 
...more params generated...
    );

openapi-generator version

4.3.0

No repository file or test is named. Start with the supplied OpenAPI YAML and compare the generated Feign interface, especially the form fields currently emitted as @RequestParam values; done means those fields are represented in the request body as the expected form model and sent as body parameters rather than query parameters.