Update rb-sys (#481)

Merge pull request #420 from bytecodealliance/update-cross-gem

Update cross-gem action

Update to wasmtime v27 (#401)

Includes small adjustments to adhere to Wasmtime's API, namely:

* Instace allocation param type in `Configuration`
* Trying to access the value of an externref can now return `None`,
  which is treated as `nil`

Bump wasmtime to v26 (#389)

* Bump wasmtime to v26

* Ignore example's crate Cargo.lock

Update to wasmtime v25.0.2 (#386)

Contains fixes for the following advisories:
* GHSA-q8hx-mm92-4wvg
* GHSA-7qmx-3fpx-r45m