seafile-shared: update hash

`seafile-client` does not build successfully because of a hash mismatch
in `seafile-shared`. The old hash appears to point to commit
`b7f2be78c1d979ff1242c3b65b41228e31427843` rather than
`ea8f5e2b45612d77fee9934f942d1d7d55560dad`, which is the commit that the
`v6.2.10` tag currently references.