Wasmtime upstream 46.0.0 available (currently 45.0.2)

[github-actions]

Upstream bytecodealliance/wasmtime has released v46.0.0.

• Current pin: 45.0.2 (wasmtime-version.properties)
• Upstream latest: 46.0.0
• Release notes: https://github.com/bytecodealliance/wasmtime/releases/tag/v46.0.0

To upgrade:

1. Edit wasmtime-version.properties (wasmtime.version=46.0.0)
2. Run ./scripts/sync-wasmtime-version.sh
3. cargo update -p wasmtime and rebuild

This issue is auto-managed by .github/workflows/wasmtime-upstream-watch.yml.