Doug Parker c0ed68d614 docs: update yarn command to freeze lockfile.
In today's release, running `yarn` modified the `yarn.lock` file, which is not desireable for releases which should be as close to CI as possible. This updates the docs to freeze the lockfile (similar to `npm ci`) to avoid changing dependency verisons mid-release.
2021-03-18 10:44:33 +01:00
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