How to build the latest release or alpha versions of Tor Browser

Sorry to raise this as an issue, but I had no luck getting an answer at the forum. I've forked the repo and set up my local dev environment. Question: Which branch do I checkout to build either the latest (stable) release or the latest released alpha version of TB? I've read the docs, but I can't see any branch tag ending "13.5.2" or "14.0a1". Many thanks.

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