[nats] Release v2.1.0
[nats] Release v2.1.0

Details can be found [here](https://github.com/nats-io/nats-server/releases/tag/v2.1.0)

Signed-off-by: Ivan Kozlovic <a15f8b81a160b4eebe5c84e9e3b65c87b9b2f18e@synadia.com>

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