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#404 added the git repository https://github.com/OpenZeppelin/openzeppelin-community-contracts/ as a dependency. This caused the test builds to encounter issue yarnpkg/yarn#7212.
As a workaround, as described in a comment in that yarn issue, we can use
yarn install --network-concurrency 1
.This can be reverted when we release https://github.com/OpenZeppelin/openzeppelin-community-contracts/ as an NPM package and switch the dependency to use that.