Add yarn integrity hashes
What does this MR do?
yarn >= 1.10.0 adds sha512 integrity checks to the yarn.lock file. For more details see https://github.com/yarnpkg/yarn/pull/5042. The behaviour is backwards compatible.
Does this MR meet the acceptance criteria?
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Changelog entry added, if necessary -
Documentation created/updated -
Tests added for this feature/bug -
Conforms to the code review guidelines -
Conforms to the merge request performance guidelines -
Conforms to the style guides -
Conforms to the database guides