chore(deps): update rust to 0.7

[bootc-bot]

This PR contains the following updates:

Package	Type	Update	Change
zlink	workspace.dependencies	minor	0.6 → 0.7
zlink-core	workspace.dependencies	minor	0.6 → 0.7

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Release Notes

z-galaxy/zlink (zlink)

v0.7.0

Compare Source

Added

• ✨ Support skip and flatten in Type/CustomType.

Changed

• 🏗️ Make the runtime features additive.

Documentation

• 📝 Mention the book in the README.
• 📝 Link to the examples directory instead of duplicating it.
• 📝 Document the resolved example in the examples README.
• 📝 Remove obsolete USB transport note and document smol crate.

Testing

• ✅ Test the book examples as doctests.
• ✅ Use a valid Varlink type name in a custom-type test.

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