Bump external/bpf_conformance from `b544539` to `3357834` #1464

Job	Run time
build_windows (Debug, tests)	35m 30s
build_windows (Debug, library)	5m 8s
build_ubuntu (Debug, tests)	26m 45s
build_windows (Release, tests)	9m 27s
build_ubuntu (Debug, library)	1m 6s
build_windows (Release, library)	5m 41s
build_ubuntu (Release, tests)	6m 10s
build_ubuntu (Release, library)	1m 15s
	1h 31m 2s

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