python-rank-bm25 from home:birdwatcher:OpenWebUI project

需要 15.6 ，用 root 執行：

zypper addrepo https://download.opensuse.org/repositories/home:birdwatcher:OpenWebUI/15.6/home:birdwatcher:OpenWebUI.repo
zypper refresh
zypper install python-rank-bm25