chore: 🐝 Update SDK - Generate 0.3.1

[github-actions]

Important

Linting report available at: https://app.speakeasy.com/org/apideck-k2o/apideck/linting-report/93769872f8ddcf54673a41def03d6ea1
OpenAPI Change report available at: https://app.speakeasy.com/org/apideck-k2o/apideck/changes-report/708348e80c5c407d8ac0f89abd821e79

SDK update

Based on:

• OpenAPI Doc
• Speakeasy CLI 1.468.5 (2.493.11) https://github.com/speakeasy-api/speakeasy

Versioning

Version Bump Type: [patch] - 🤖 (automated)

OpenAPI Change Summary

└─┬Components
  ├─┬Bill
  │ └─┬bill_date
  │   └──[➕] nullable (11605:21)❌ 
  └─┬DueDate
    └──[➕] nullable (14486:17)❌ 

Document Element	Total Changes	Breaking Changes
components	2	2

CSHARP CHANGELOG

No relevant generator changes

[Amzani]

LGTM