[BUG] Generator for cpp-restbed-server fails for vector of vector of floats

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?

Description

openapi-generator version

openapi-generator version 7.0.1
I do not know if this ever worked or if it is a regression. First time we've tried it.

OpenAPI declaration file content or url

Configuration cpp-restbed-server.yaml is plain:

additionalProperties:
  packageName: 'dsk360_restbed'
  packageVersion: '0.0.0'
  apiPackage: 'ds.web.rest.server'
  modelPackage: 'ds.web.rest.models'

Generation Details

Steps to reproduce

curl -s https://gist.github.com/sbarber-dsi/d7658f12c879704b9c8834e0bdd1338d >cpp-restbed-server.yaml
curl -s https://gist.github.com/sbarber-dsi/33d218666a76591cedeaac0a711f417b >openapi.json
openapi-generator-cli generate -g cpp-restbed-server -i openapi.json -c cpp-restbed-server.yaml -o test_api_cpp-restbed-server

Related issues/PRs

I didn't find any

Suggest a fix

The final type of the float is missing; just needs a <double> added.

e.g. generated code

    std::function<std::pair<int, std::vector<std::vector>>(
        )> handler_GET_func =
            []() -> std::pair<int, std::vector<std::vector>>
                { throw TestAtlasApiException(501, "Not implemented"); };

should be

    std::function<std::pair<int, std::vector<std::vector<double>>>(
        )> handler_GET_func =
            []() -> std::pair<int, std::vector<std::vector<double>>>
                { throw TestAtlasApiException(501, "Not implemented"); };

And then it all builds and works.

Start by running the listed generation command with openapi.json and cpp-restbed-server.yaml, then inspect the generated handler_GET_func declarations in test_api_cpp-restbed-server. Compare the nested vector type with the expected output in the issue and confirm the generated C++ builds successfully.