Update README to reflect inference engines terminology #2958

Job	Run time
check-schema / schema	9s
check-package / pkg-build (ubuntu-latest)	18s
check-package / merge-artifacts	15s
check-package / pkg-check (macos-latest, 3.10)	1m 11s
check-package / pkg-check (windows-latest, 3.10)	1m 10s
check-package / pkg-check (ubuntu-latest, 3.10)	45s
check-package / pkg-guardian	3s
	3m 51s

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