uuidgen should generate lowercase uuid

Number:rdar://FB9960369 Date Originated:2022-03-17
Status:Open Resolved:
Product:macOS Product Version:21D62
Classification: Reproducible:
Per RFC 4122, section 3: "The hexadecimal values "a" through "f" are output as lower case characters"

This is a request to have `uuidgen` updated to output generated UUIDs in all lower case.

"%08x-%04x-%04x-%04x-%012x" (with lowercase 'x') should be used instead of "%08X-%04X-%04X-%04X-%012X" that is noted in UUIDGEN(1)


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