chore(deps): update rust crate ptr_meta to 0.3.0

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
ptr_meta	workspace.dependencies	minor	0.2.0 -> 0.3.0

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Release Notes

rkyv/ptr_meta (ptr_meta)

v0.3.0

Compare Source

• Implement Pointee for dyn core::error::Error
• Add impls for trait objects plus Send and Sync
• Replace PtrExt and NonNullExt with free functions
• Fix DynMetadata implementation under MIRI
• Add crate = .. derive argument
• Update syn to 2
• Set MSRV to 1.81

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[nicholasbishop]

Closing this for now -- it requires Rust 1.81, per our msrv policy we can do this update when 1.83 is released

[renovate]

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