update the version json file for website (#7868)
Signed-off-by: Nxiaolong.ran <rxl@apache.org>
### Modifications
Use the 2.6.1 version of the docs as the latest stable version
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Signed-off-by: Nxiaolong.ran <rxl@apache.org>
### Modifications
Use the 2.6.1 version of the docs as the latest stable version