adjust `Cargo.toml` to ensure `sourmash_plugin_branchwater` compatibility

[bluegenes]

Note that for sourmash_plugin_branchwater compatibility, we need:

• byteorder = "1.4.3"
• wasm-bindgen = "0.2.89"
• once_cell = "1.18.0"
• chrono = 0.4.32

we could pin to these exactly (==? )to prevent dependabot updates

[ctb]

two notes:

• this needs to be done in src/core/Cargo.toml
• there seems to be no simple way to "pin" this with respect to dependabot specifically, or Rust tests generally. So barring magic ✨ that @luizirber knows about, we simply need to keep an eye out for these.

Actually... I wonder if we could just specify <=? That seems dangerous tho. Or maybe

byteorder >= "1.4.3",<="1.4.3"

[ctb]

turns out there's a way to set "ignore" on certain packages - just had to find the right search string, "how can I prevent dependabot from upgrading specific packages"

[mr-eyes]

turns out there's a way to set "ignore" on certain packages - just had to find the right search string, "how can I prevent dependabot from upgrading specific packages"

dependabot ignore?
Update: Sorry, just realized you applied it, not looking for it.