deps: update icu to include tzdata2020a
Closes https://github.com/nodejs/Release/issues/576.
Updates source/data/in/icudt66l.dat
file with updated binary time zone data files corresponding to new IANA tzdata releases in https://github.com/unicode-org/icu/commit/a951ab59c7ceba3ca0873ac16984426bfbf62725.
I followed the steps in https://github.com/nodejs/node/pull/30364, but as i have not done this before I'd appreciate a confirmation that i did it correctly if possible.
cc @apaprocki @targos @srl295
Checklist
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make -j4 test
(UNIX), orvcbuild test
(Windows) passes -
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