deps: update uint8-varint to 2.0.0 #97

Job	Run time
check	6m 29s
test-node (windows-latest, lts/*)	4m 41s
test-node (ubuntu-latest, lts/*)	2m 2s
test-node (macos-latest, lts/*)	3m 55s
test-chrome-webworker	2m 54s
test-firefox	2m 8s
test-chrome	3m 7s
test-electron-main	2m 46s
test-firefox-webworker	2m 47s
test-webkit (ubuntu-latest, lts/*)	2m 12s
test-webkit (macos-latest, lts/*)	4m 0s
test-webkit-webworker (ubuntu-latest, lts/*)	2m 36s
test-webkit-webworker (macos-latest, lts/*)	5m 49s
test-electron-renderer	2m 36s
release	0s
	48m 2s

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