BitShares Testnet release test-6.1.1

[abit]

BitShares Testnet release test-6.1.1 https://github.com/bitshares/bitshares-core/releases/tag/test-6.1.1 mainly with fixes to the Elastic Search plugins.

Testnet nodes running version test-6.1.0 with the `elasticsearch` plugin or the `es_objects` plugin enabled need to be upgraded. Other Testnet nodes are recommended to be upgraded, although not required.

More info on the release page (release notes, binaries, docker and etc).