Nightly versions are the same as stable ones

Run `git submodule status | sort` and you'll see that, for the paths that have nightly versions, the commit IDs of stable and nightly versions are the same. For example, [this file](https://github.com/FuelLabs/sway/compare/v0.66.5...master#diff-09335b9d06c2ec330f7b786a36349b044ce3bc672cc1d19e2fabd13beff519c1) in the sway docs should be different when the docs are set to `nightly` but it's not.

This is happening because the commit version [fetched](https://github.com/FuelLabs/docs-hub/blob/fbf1579c50dc8cd4e73124d0e0e84eca9d440340/scripts/update-nightly/updateSubmodules.mjs#L103) for the nightly version is the same as the latest release, so the commit IDs of the stable and nightly submodules are the same.