[BUG] [SPRING-CLOUD] Multiple Security breaks the generated code

[MelleD]

If you use multiple security schemes, the spring cloud generator code generator breaks and produces non-compilable code.

  securitySchemes:
    oauth:
      type: oauth2
      flows:
        authorizationCode:
          authorizationUrl: '/auth'
          tokenUrl: '/token'
          scopes: { }
        clientCredentials:
          tokenUrl: '/token'
          scopes: { }
    basicAuth:
      type: http
      scheme: basic

I was able to fix that so far and I would still include it in the PR.
#16011