Set VERSION to v1.14.0 #159

Job	Run time
Check whether tests need to be run based on diff	22s
Verify docs and spelling	52s
Build Antrea and antctl binaries	19m 57s
Golangci-lint (ubuntu-latest)	13m 49s
Golangci-lint (macos-latest)	11m 59s
Go benchmark test	7m 37s
Integration test	14m 47s
Unit test (ubuntu-latest)	11m 4s
Check tidy, code generation and manifest	8m 41s
Unit test (windows-2022)	27m 8s
Build Antrea Windows binaries	2m 53s
	1h 59m 9s

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