update the version json file for website (#7868)
update the version json file for website (#7868)

Signed-off-by: xiaolong.ran <7d13e43fbbc3fc16d27e460280d19c5113a24274@apache.org>


### Modifications

Use the 2.6.1 version of the docs as the latest stable version
merlimat/pulsar,massakam/pulsar,massakam/pulsar,merlimat/pulsar,yahoo/pulsar,merlimat/pulsar,massakam/pulsar,massakam/pulsar,massakam/pulsar,yahoo/pulsar,merlimat/pulsar,yahoo/pulsar,merlimat/pulsar,yahoo/pulsar,merlimat/pulsar,yahoo/pulsar,yahoo/pulsar,massakam/pulsar