Update dependency Swashbuckle.AspNetCore.Filters to v6

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
Swashbuckle.AspNetCore.Filters	nuget	major	5.1.2 -> 6.0.0

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Release Notes

mattfrear/Swashbuckle.AspNetCore.Filters

v6.0.0

Compare Source

Fixed

• Issue #​132 Support [System.Text.JsonPropertyNameAttribute]. This is a breaking change which rewrote how the examples
  are generated. Instead of explicitly using Newtonsoft's JsonConvert.SerializeObject(), I now use whichever JSON
  serializer is registered with the MVC pipeline, i.e. during services.AddControllers().

Removed

• contractResolver and jsonConverter parameters from [SwaggerRequestExampleAttribute].
• contractResolver and jsonConverter parameters from [SwaggerResponseExampleAttribute].
• Microsoft.AspNetCore.Mvc.NewtonsoftJson dependency.

Changed

• If you are using options.IgnoreObsoleteProperties(); and you want your Examples to not have the
  obsolete properties, then you will need to register my custom Newtonsoft ExcludeObsoletePropertiesResolver,
  e.g.

services.AddControllers()
    .AddNewtonsoftJson(opt =>
    {
        opt.SerializerSettings.ContractResolver = new ExcludeObsoletePropertiesResolver(opt.SerializerSettings.ContractResolver);

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