chore: bump up version to 0.2.1 (#107) #43

Job	Run time
Build, Tag, and Push Image (examples/map-cat)	3m 28s
Build, Tag, and Push Image (examples/map-tickgen-serde)	2m 6s
Build, Tag, and Push Image (examples/mapt-event-time-filter)	2m 17s
Build, Tag, and Push Image (examples/reduce-counter)	2m 5s
Build, Tag, and Push Image (examples/sideinput)	2m 7s
Build, Tag, and Push Image (examples/sideinput/udf)	2m 49s
Build, Tag, and Push Image (examples/simple-source)	2m 8s
Build, Tag, and Push Image (examples/sink-log)	2m 13s
Build, Tag, and Push Image (examples/source-transformer-now)	2m 6s
Build, Tag, and Push Image (examples/batchmap-flatmap)	2m 24s
Build, Tag, and Push Image (examples/batchmap-cat)	2m 4s
	25m 47s

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