Update `wasmtime` version in CI

[saulecabrera]

This commit updates the wasmtime version used in CI, which is currently a very outdated version. The new version matches the version used in the CLI.

Additionally, this commit introduces a mechanism to retrieve the wasmtime CLI version from cargo metadata through jq

Checklist

• [x] I've updated the relevant CHANGELOG files if necessary. Changes to javy-cli and javy-core do not require updating CHANGELOG files.
• [x] I've updated the relevant crate versions if necessary. Versioning policy for library crates
• [x] I've updated documentation including crate documentation if necessary.

[saulecabrera]

One alternative is to read the wasmtime version from the Cargo.toml directly. It's probably a bit more involved, but such approach will guarantee that the wasmtime versions will be in sync. I'm defaulting to the current approach for now; we can always come back and adjust. Found a nicer way of using cargo metadata + jq to solve the sync issue.