Add new AudienceGroupType TRACKINGTAG_WEBTRAFFIC to Audience Group API (#920)

line/line-openapi#118

# Add `TRACKINGTAG_WEBTRAFFIC` to **AudienceGroupType** Enum

We have supported for the new audience‑group type
**`TRACKINGTAG_WEBTRAFFIC`** (Tracking Tag Webtraffic audience) to the
OpenAPI schema.

## Changes Made

* **Updated `AudienceGroupType` enumeration**

  * **New value**: `TRACKINGTAG_WEBTRAFFIC`
* **Description**: Audience groups generated from Tracking Tag
Webtraffic.

## Purpose

This update enables correct identification and handling of audience
groups built from Tracking Tag Webtraffric.

## Documents and Reference

- [Managing
Audience](https://developers.line.biz/en/reference/messaging-api/#manage-audience-group)
- [News](https://developers.line.biz/en/news/2026/01/21/tracking-tag/)

For more information, please refer to the links provided above.

Co-authored-by: github-actions <github-actions@github.com>

Author: github-actions[bot]

line-openapi

@@ -42,6 +42,7 @@ class AudienceGroupType(str, Enum):
     RICHMENU_IMP = 'RICHMENU_IMP'
     RICHMENU_CLICK = 'RICHMENU_CLICK'
     POP_AD_IMP = 'POP_AD_IMP'
+    TRACKINGTAG_WEBTRAFFIC = 'TRACKINGTAG_WEBTRAFFIC'
 
     @classmethod
     def from_json(cls, json_str: str) -> AudienceGroupType: