Cannot build from source with 1.26rc2

```
mcphost.exe: can't install github.com/mark3labs/mcphost:
# github.com/bytedance/sonic/internal/rt
go\pkg\mod\github.com\bytedance\sonic@v1.14.1\internal\rt\stubs.go:33:22: undefined: GoMapIterator
go\pkg\mod\github.com\bytedance\sonic@v1.14.1\internal\rt\stubs.go:36:54: undefined: GoMapIterator
```

Resolvable by bumping sonic to 1.15: https://github.com/bytedance/sonic/releases/tag/v1.15.0