[v12.x] backport npm updates and macOS notarization#32527

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MylesBorins wants to merge 7 commits intonodejs:v12.x-stagingfrom

MylesBorins:v12.x-notarization

Commits on Apr 1, 2020

deps: upgrade npm to 6.14.1

isaacs
authored and
MylesBorins
committed
deps: update npm to 6.14.3
MylesBorins
committed
deps: remove *.pyc files from deps/npm

bnoordhuis
authored and
MylesBorins
committed
deps: update term-size with signed version

rvagg
authored and
MylesBorins
committed
deps: upgrade npm to 6.14.4

ruyadorno
authored and
MylesBorins
committed
build: macOS package notarization

rvagg
authored and
MylesBorins
committed
doc: official macOS builds now on 10.15 + Xcode 11

rvagg
authored and
MylesBorins
committed