Fix extensions test by pinning "home" crate version

Build was failing with the following error:

```
error: rustc 1.85.0 is not supported by the following package:
  home@0.5.12 requires rustc 1.88
Either upgrade rustc or select compatible dependency versions with
`cargo update <name>@<current-ver> --precise <compatible-ver>`
where `<compatible-ver>` is the latest version supporting rustc 1.85.0
```