Update to Wasmtime 23

[jeffcharles]

Update to Wasmtime 23.0.2.

This enables the memory-protection-keys feature in Wasmtime so the pooling allocator configuration options that are gated by this feature can be used. Otherwise we would likely have to remove the API to enable using these configuration options. There haven't been any complaints about performance so keeping that logic in place should be fine.

The tests for the pooling allocator config have also been updated since Wasmtime no longer rounds up the value to a page size at configuration time but does it at runtime instead (see this commit message in Wasmtime for details).

[jeffcharles]

I think the build_doc step is failing because we're using nightly-2023-12-30 for that job and Wasmtime 23 requires at least Rust 1.77.0.