RUSTSEC-2021-0110: Multiple Vulnerabilities in Wasmtime

[github-actions]

Multiple Vulnerabilities in Wasmtime

Details
Package	wasmtime
Version	0.27.0
Date	2021-09-17
Patched versions	>=0.30.0

• Use after free passing externrefs to Wasm in
  Wasmtime

• Out-of-bounds read/write and invalid free with externrefs and GC safepoints
  in
  Wasmtime

• Wrong type for Linker-define functions when used across two
  Engines

See advisory page for additional details.

[leoyvens]

None of these affect our use of wasmtime afaict. But still it would be good to upgrade.