Bump github.com/ipfs/go-merkledag from 0.7.0 to 0.8.1 in /datahop#9

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maindatahop/test-plans:mainfrom

dependabot/go_modules/datahop/github.com/ipfs/go-merkledag-0.8.1datahop/test-plans:dependabot/go_modules/datahop/github.com/ipfs/go-merkledag-0.8.1Copy head branch name to clipboard