Update the chart version

After including the environment variables for NATS, the version was not
updated.

Signed-off-by: Georgi Michev <georgi.michev@vereign.com>

Chart.yaml

 apiVersion: v1
-appVersion: v1.2.0
+appVersion: v1.2.1
 description: task deployment
 name: task
-version: 1.2.0
+version: 1.2.1
 icon: "https://www.vereign.com/wp-content/themes/vereign2020/images/vereign-logo.svg"