rust: enable the `pin_macro` feature

This feature enables the use of the `pin!` macro for the `stack_pin_init!`
macro. This feature is already stabilized in Rust version 1.68.

Signed-off-by: Benno Lossin <[email protected]>
Reviewed-by: Alice Ryhl <[email protected]>
Reviewed-by: Gary Guo <[email protected]>
Reviewed-by: Andreas Hindborg <[email protected]>
Acked-by: Boqun Feng <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Miguel Ojeda <[email protected]>

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