bump-stage0: pick highest common `toml` version, add a workaround

- We pick the higest common `toml` version used in the r-l/r workspace
  to avoid introducing Yet Another `toml` `0.x` version, which happens
  to be `0.8.23` as of the time of writing.
- We introduce a byte-buffer-to-string workaround for the `toml 0.8.*`
  series that do not have the `toml 0.9.*` series's `toml::from_slice`
  API yet. Not efficient, but this is not perf-critical so it's fine.

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