chore(deps): update rust crate zvariant to v5.9.1

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
zvariant	workspace.dependencies	minor	5.8.0 → 5.9.1

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Release Notes

z-galaxy/zbus (zvariant)

v5.9.1

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Other

• 🤖 release-plz: Fix formatting of CHANGELOG files.
• 🤖 release-plz: Use the default header in changelog.

v5.9.0: 🔖 zbus 5.9.0

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• 🧵 Remove deadlocks in Connection name request tasks, resulting in leaks under certain
  circumstances.
• 🐛 When registering names, allow name replacement by default.
• ✨ Allow setting request name flags in connection::Builder.
• ✨ Proper Default impl for RequestNameFlags. This change is theoretically an API break for
  users who assumed the default value to be empty.
• 🧑💻 Add fdo::StartServiceReply type. In 6.0 this will be the return type of
  fdo::DBusProxy::start_service_by_name. For now, just provide a TryFrom<u32>.

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