chore: yarn-deduplicate for string-width

[alexandre-abrioux]

Issue

Adding new dependencies in the packages/utils directory is impossible. If you navigate to cd packages/utils and try to install a new package, for instance yarn add eccrypto-js, you will face the issue:

error An unexpected error occurred: "expected workspace package to exist for \"string-width\"".

The issue is described here: yarnpkg/yarn#7807

Change

The solution was to run

npx yarn-deduplicate --packages string-width

I chose to only run the fix for this specific package and not all packages in the lock file as described in Yarn's GitHub comment (I tried it at first, but this led to more issues with the build).

[coveralls]

coverage: 86.925%. remained the same
when pulling 0c9b726 on yarn-deduplicate
into a782146 on master.