help request: download link for the APISIX 3.15 RPM package

### Description

apisix3.15的文档中显示的rpm下载地址为https://repos.apiseven.com/packages/redhat/8/x86_64/apisix-3.13.0-0.ubi8.6.x86_64.rpm ，将apisix-3.13.0-0.ubi8.6.x86_64.rpm 改为apisix-3.15.0-0.ubi8.6.x86_64.rpm 是无法下载的，完整的apisix-3.15.0 rpm包下载地址是什么

### Environment

- APISIX version (run `apisix version`):
- Operating system (run `uname -a`):
- OpenResty / Nginx version (run `openresty -V` or `nginx -V`):
- etcd version, if relevant (run `curl http://127.0.0.1:9090/v1/server_info`):
- APISIX Dashboard version, if relevant:
- Plugin runner version, for issues related to plugin runners:
- LuaRocks version, for installation issues (run `luarocks --version`):

Start with the APISIX 3.15 documentation page shown in the attached image and compare its RPM link with the package repository URL in the issue. Done means the documentation points to a downloadable APISIX 3.15 RPM and the complete URL is confirmed.

Written by the indexing model from the issue text.