[PATCH] update ob-scheme to latest changes in geiser package

[Felipe Lema]

Sup, y'all

The geiser package had a recent update in which `geiser-eval-region` behaves 
like an async function and does not return evaluation result. In exchange, the 
newly introduced `geiser-eval-region/wait` does that now.

I've attached a patch to update ob-scheme.el to reflect these changes. Without 
them, evaluating scheme dialect code blocks in Org will end up with empty 
results.

To learn more about the change (and how it impacted other people's flows) see 
issue thread below

https://gitlab.com/emacs-geiser/geiser/-/issues/30

Felipe

org-babel-scheme-geiser-eval-region.wait.diff
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