Update goptlib nightly build to target main branch

Merged Cecylia Bocovich requested to merge cohosh/tor-browser-build:issue/40304 into master

Closes #40304 (closed)

Note: obfs4 is the one repo we haven't changed yet because we don't maintain it. This might change soon and we'll hold off on changing the branch until we find out how it will change :)

So afaict goptlib is the only project that needs the update.

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