Add unsafe block around DEVICE_PERIPHERALS = true in Peripherals::steal()

[kurtjd]

In edition 2024, #[warn(unsafe_op_in_unsafe_fn)] is enabled by default.

This PR adds the unsafe block around mutating DEVICE_PERIPHERALS in the generated Peripherals::steal() function. I had considered only adding this if the --edition=2024 flag was passed, but there is no harm in this being here even for earlier editions and is IMO clearer regardless. Though if folks disagree I can make that change.

[burrbull]

I can make that change

Make this, please.

[kurtjd]

I can make that change

Make this, please.

Done!

[kurtjd]

Hm CI appears to be failing for reasons unrelated to these changes. Would you like me to make the fix as part of this PR anyway?

[burrbull]

Yes, try to fix it, please.

[kurtjd]

Yes, try to fix it, please.

Should be fixed now. Looks like this PR: rust-lang/rust#138907 merged doc_auto_cfg into doc_cfg and nightly no longer supports the old name, so I updated this to generate PACs with the new name. This allows docs to be built with nightly, now allowing CI to pass.

[kurtjd]

So svd2rust-regress completed locally for me with no errors, but during CI looks like it's failing because clippy is not installed. I'll see if I can update the workflow to ensure clippy is available during CI.

[burrbull]

cc @Emilgardis

[kurtjd]

Looks like CI is passing now! Please let me know if there are any other changes you would like me to make.

[burrbull]

Please let me know if there are any other changes you would like me to make.

You could prepare PR for 0.37.1 if you want faster release.