Upgrade go-ipfix to 0.12.0 (#6897) #149

Job	Run time
Verify docs and spelling	38s
Check whether tests need to be run based on diff	13s
Integration test	5m 47s
Golangci-lint (macos-latest)	9m 35s
Golangci-lint (ubuntu-latest)	9m 27s
Unit test (ubuntu-latest)	7m 54s
Unit test (windows-2022)	15m 47s
Go benchmark test	5m 23s
Build Antrea and antctl binaries	13m 13s
Check tidy, code generation and manifest	4m 36s
Build Antrea Windows binaries	2m 16s
	1h 14m 49s

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