deps: bump @multiformats/mafmt from 11.1.2 to 12.1.6 (#91) #45

Job	Run time
js-test-and-release / check	55s
js-test-and-release / test-chrome-webworker	26s
js-test-and-release / test-electron-renderer	12s
js-test-and-release / test-chrome	27s
js-test-and-release / test-electron-main	20s
js-test-and-release / test-firefox	19s
js-test-and-release / test-firefox-webworker	19s
js-test-and-release / test-node (windows-latest, lts/*)	2m 23s
js-test-and-release / test-webkit (ubuntu-latest, lts/*)	10s
js-test-and-release / test-node (ubuntu-latest, lts/*)	15s
js-test-and-release / test-webkit (macos-latest, lts/*)	1m 8s
js-test-and-release / test-node (macos-latest, lts/*)	1m 38s
js-test-and-release / test-webkit-webworker (ubuntu-latest, lts/*)	12s
js-test-and-release / test-webkit-webworker (macos-latest, lts/*)	1m 50s
js-test-and-release / release-check	2s
js-test-and-release / release	37s
	11m 13s

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