chore(deps): bump zbus from 4.3.1 to 4.4.0

[dependabot[bot]]

Bumps zbus from 4.3.1 to 4.4.0.

Release notes

Sourced from zbus's releases.

🔖 zbus 4.4.0

• 🚑️ Fix regression of not replying to inexistent methods. #905.
• 🐛 Fix a potential deadlock during name registration.
• ✨ Add optional heapless feature, which is just a proxy to zvariant feature of the same name.
• ⬆️ Require zvariant 4.2.0.

Commits

• 51ed473 Merge pull request #907 from zeenix/releases
• d63fea2 🔖 zb,zm: Release 4.4.0
• 758965f ⬆️ zb: Bump zvariant requirement to latest
• b7723a7 🔖 zv,zd: Release 4.2.0
• f04baef 🔖 zu: Release 2.1.0
• 8e3d2b3 Merge pull request #906 from zeenix/non-existant-method
• 9283fc6 🚑️ zb: Fix regression of not replying in inexistent methods
• 9746e87 🧪 zb: Test case for #905
• 6b1b923 ⬆️ Update tokio to v1.38.1
• eeed9a6 Merge pull request #899 from bachp/zvariant_derive-kebab-case
• Additional commits viewable in compare view

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