pijul: update to 1.0.0-beta.2

[leesongun]

This PR updates pijul from 0.12.2 to 1.0.0-beta.2, preparing for 1.0.0.

But since it seems there was non-backward-compatible format change since 0.12.2 and 1.0.0-beta guarantees format stability, this could be better than current version for future compatibility.

Testing the changes

• I tested the changes in this PR: briefly

Local build testing

[classabbyamp]

how does using the beta solve the compat issues? wouldn't the same compat issue exist when going from 0.122 to 1.0.0-beta? I read the pages you linked to say that 1.0.0-beta onward will have a stable format guarantee.

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