Upgrade for Swashbuckle.AspNetCore 5.x

LowercaseDocumentFilter.cs

using Microsoft.OpenApi.Models;
using Swashbuckle.AspNetCore.Swagger;
using Swashbuckle.AspNetCore.SwaggerGen;
using System.Collections.Generic;

namespace BoundedContext.Web.Swagger
{
    /// <summary>
    /// This class orginally was created by https://gist.github.com/smaglio81 and modified version used in this project you can find here
    /// https://gist.github.com/rafalkasa/01d5e3b265e5aa075678e0adfd54e23f
    /// </summary>
    public class LowercaseDocumentFilter : IDocumentFilter
	{
        public void Apply(OpenApiDocument swaggerDoc, DocumentFilterContext context)
        {
            ////////	PATHS

            var paths = swaggerDoc.Paths;

            //	generate the new keys
            var newPaths = new Dictionary<string, OpenApiPathItem>();
            var removeKeys = new List<string>();
            foreach (var path in paths)
            {
                var newKey = path.Key.ToLower();
                if (newKey != path.Key)
                {
                    removeKeys.Add(path.Key);
                    newPaths.Add(newKey, path.Value);
                }
            }

            //	add the new keys
            foreach (var path in newPaths)
            {
                swaggerDoc.Paths.Add(path.Key, path.Value);
            }

            //	remove the old keys
            foreach (var key in removeKeys)
            {
                swaggerDoc.Paths.Remove(key);
            }
        }
    }
}