chore: bump up version to 0.2.1 (#107) #42

Job	Run time
Build, Tag, and Push Image (examples/map-cat)	2m 10s
Build, Tag, and Push Image (examples/map-tickgen-serde)	2m 10s
Build, Tag, and Push Image (examples/mapt-event-time-filter)	2m 14s
Build, Tag, and Push Image (examples/reduce-counter)	1m 57s
Build, Tag, and Push Image (examples/sideinput)	2m 1s
Build, Tag, and Push Image (examples/sideinput/udf)	2m 23s
Build, Tag, and Push Image (examples/simple-source)	2m 22s
Build, Tag, and Push Image (examples/sink-log)	2m 7s
Build, Tag, and Push Image (examples/source-transformer-now)	2m 11s
Build, Tag, and Push Image (examples/batchmap-flatmap)	2m 13s
Build, Tag, and Push Image (examples/batchmap-cat)	2m 7s
	23m 55s

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