Plugin example does not compile

[gfxenjoyer]

Bug Description

The plugin example as of 3cfa04fa9179647fb78e54a32e9488617f6fbbe9 does not compile.

Steps to Reproduce

1. cd examples/plugin
2. cargo run

Backtrace

Compiling plugin_example v0.1.0 (C:\Users\\Documents\GitHub\pyo3\examples\plugin)
error[E0277]: the trait bound `&PyList: FromPyObjectBound<'_, '_>` is not satisfied
   --> src/main.rs:16:67
    |
16  |         let syspath: &PyList = py.import("sys")?.getattr("path")?.extract()?;
    |                                                                   ^^^^^^^ the trait `PyClass` is not implemented for `&PyList`, which is required by `&PyList: FromPyObjectBound<'_, '_>`
    |
    = help: the following other types implement trait `FromPyObjectBound<'a, 'py>`:
              &'a [u8]
              &'a str
              Cow<'a, [u8]>
              Cow<'a, str>
    = note: required for `&PyList` to implement `FromPyObject<'_>`
    = note: required for `&PyList` to implement `FromPyObjectBound<'_, '_>`
note: required by a bound in `pyo3::types::PyAnyMethods::extract`
   --> C:\Users\\Documents\GitHub\pyo3\src\types\any.rs:815:12
    |
813 |     fn extract<'a, T>(&'a self) -> PyResult<T>
    |        ------- required by a bound in this associated function
814 |     where
815 |         T: FromPyObjectBound<'a, 'py>;
    |            ^^^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `PyAnyMethods::extract`

error[E0599]: no method named `insert` found for reference `&PyList` in the current scope
  --> src/main.rs:17:17
   |
17 |         syspath.insert(0, &path)?;
   |                 ^^^^^^ method not found in `&PyList`

error[E0277]: `PyList` doesn't implement `Debug`
  --> src/main.rs:18:42
   |
18 |         println!("Import path is: {:?}", syspath);
   |                                          ^^^^^^^ `PyList` cannot be formatted using `{:?}` because it doesn't implement `Debug`
   |
   = help: the trait `Debug` is not implemented for `PyList`, which is required by `&PyList: Debug`
   = note: this error originates in the macro `$crate::format_args_nl` which comes from the expansion of the macro `println` (in Nightly builds, run with -Z macro-backtrace for more info)

Some errors have detailed explanations: E0277, E0599.
For more information about an error, try `rustc --explain E0277`.
error: could not compile `plugin_example` (bin "plugin_example") due to 3 previous errors

### Your operating system and version

Windows 11

### Your Python version (`python --version`)

Python 3.12.5

### Your Rust version (`rustc --version`)

rustc 1.80.1 (3f5fd8dd4 2024-08-06)

### Your PyO3 version

0.22.2

### How did you install python? Did you use a virtualenv?

python.org. no virtualenv

### Additional Info

_No response_

[birkenfeld]

Indeed. Looks like our CI does not build all examples? 😱