Update version to 4.0.21-SNAPSHOT #95

Job	Run time
create-tag	6s
validate / checkstyle	3m 28s
validate / copyright	3m 13s
validate / build	4m 58s
validate / shellcheck	3m 11s
validate / vscode-ext	4m 3s
validate / javadoc	4m 0s
validate / spotbugs	5m 30s
validate / tests/others-linux	6m 18s
validate / tests/cli-functional-linux	4m 51s
validate / tests/cli-functional-windows	5m 3s
validate / tests/cli-linux	4m 2s
validate / tests/cli-windows	4m 20s
validate / tests/archetype-windows	5m 51s
validate / tests/archetype-linux	5m 0s
validate / tests/linker-linux	4m 51s
validate / tests/others-windows	7m 31s
validate / tests/linker-windows	5m 6s
validate / cli/windows-amd64	5m 26s
validate / cli/linux-amd64	4m 47s
validate / cli/darwin-amd64	5m 43s
validate / cli/binaries	7s
validate / tests/results	7s
validate / gate	2s
stage	5m 1s
deploy	20s
release-cli	0s
	1h 42m 55s

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