[BUG][HASKELL] Multiple SecuritySchemes produce Multiple Declarations Error

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?
• [Optional] Sponsorship to speed up the bug fix or feature request (example)

Description

When specifying multiple securitySchemes one cannot compile the generated Haskell code.

openapi-generator version

6.1.0-SNAPSHOT

OpenAPI declaration file content or url

openapi: 3.0.0
info:
  version: 1.0.0
  title: My API
  description: some description
components:
  securitySchemes:
    basicAuth:
      type: http
      scheme: basic
    bearerAuth:
      type: http
      scheme: bearer
      bearerFormat: JWT
paths:
  /test:
    get:
      responses:
        '200':
          description: some description

Generation Details

No config. Nothing special

Steps to reproduce

1. create minimal.yaml with the content above
2. docker run --rm -v "${PWD}:/local" openapitools/openapi-generator-cli:latest generate -o /local/out -g haskell -i /local/minimal.yaml
3. cd out/
4. stack build <-- fails

Reproduce the issue with minimal.yaml using the documented Docker generation command, then run stack build in the generated out/ directory. Inspect the generated Haskell declarations and the compiler error to locate the conflicting security-scheme output. Done means the same specification generates Haskell code that compiles successfully.