Update libovsdb to its new location

[swtaylor]

ovn.org/libovsdb has been archived and moved to ovn-kubernetes/libovsdb and that repo no longer has tags.

Your go.mod references:
github.com/ovn-org/libovsdb v0.6.1-0.20240125124854-03f787b1a892

but go mod tidy fails if the old package isn't already in the cache:
github.com/ovn-org/libovsdb/server: github.com/ovn-org/libovsdb@v0.6.1-0.20240125124854-03f787b1a892: invalid pseudo-version: preceding tag (v0.6.0) not found

[adrianchiris]

#922