Update Rust crate allocator-api2 to 0.4.0

[oxide-renovate]

This PR contains the following updates:

Package	Type	Update	Change
allocator-api2	workspace.dependencies	minor	0.2.21 → 0.4.0

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Release Notes

zakarumych/allocator-api2 (allocator-api2)

v0.4.0

Added

• Implementation of Allocator for &mut A as it was added to core
• Implementation Default for vec::IntoIter
• Suffixed methods to SliceExt

Changed

• Use core::error::Error under "fresh-rust" feature even without "std" feature.
• Serialize for Box<T, A> is relaxed to accept T: ?Sized
• serde_core crate is used instead of serde to remove dependency on serde_derive when some other crate enables "derive" feture in serde

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