Bump external/bpf_conformance from `28ddd7f` to `9222222` #1505

Job	Run time
build_ubuntu (Debug, tests)	21m 23s
build_windows (Debug, tests)	39m 43s
build_ubuntu (Debug, library)	1m 3s
build_windows (Debug, library)	4m 55s
build_ubuntu (Release, tests)	6m 10s
build_windows (Release, tests)	10m 32s
build_ubuntu (Release, library)	1m 8s
build_windows (Release, library)	4m 47s
	1h 29m 41s

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