check minimum ICU version for system-icu

[srl295]

• Platform: all
• Subsystem: deps

See https://crbug.com/v8/8401

Need to check that the system ICU meets minimum requirements.

Missed this with #19657

[srl295]

also note that with the crbug above, ICU version 63 will be required and need to be bumped in tools/icu/icu_versions.json (from 57 to 63)…