[BUG] sharp-giraffe-server creates project with Nuget ref to a deleted package

Created by: misterspeedy

Bug Report Checklist

Have you provided a full/minimal spec to reproduce the issue?
Have you validated the input using an OpenAPI validator (example)? (N/A)
What's the version of OpenAPI Generator used?
Have you search for related issues/PRs?
What's the actual output vs expected output?
[Optional] Bounty to sponsor the fix (example)

Description

The generator for fsharp-giraffe-server generates a project which has a reference to a Nuget package which has since been deleted, i.e. AspNet.Security.ApiKey.Providers.

openapi-generator version

4.2.1

OpenAPI declaration file content or url

https://raw.githubusercontent.com/OAI/OpenAPI-Specification/master/examples/v3.0/petstore.yaml

Command line used for generation

openapi-generator generate -i https://raw.githubusercontent.com/OAI/OpenAPI-Specification/master/examples/v3.0/petstore.yaml -g fsharp-giraffe-server -o ./petstore

Steps to reproduce

Install v4.2.1
Run command line above
cd petstore/OpenAPI
./build.bat or ./build.sh
Note error:

OpenAPI.fsproj : error NU1101: Unable to find package AspNet.Security.ApiKey.Providers. No packages exist with this id in source(s): Microsoft Visual Studio Offline Packages, nuget, (our private feeds)
Edit src/OpenAPI.fsproj, note reference to AspNet.Security.ApiKey.Providers
Navigate to https://www.nuget.org/packages/AspNet.Security.ApiKey.Providers/
Note 'This package has been deleted from the gallery`.

Related issues/PRs

None found.

Suggest a fix

Not sure what role the missing package was intended to take, but I guess we need to either:

Remove the reference in the generated code and remove any - presumably optional - generated code which would have used the package OR
Identify a replacement package to perform the same role and amend generated code accordingly.

(The output of the generator looks very good apart from this, so I'm hoping this issue will be easy to fix ;-) .)