Bump netbird submodule to v0.75.1

[netbirddev]

Automated submodule bump triggered by netbird release v0.75.1.

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Summary by CodeRabbit

• Chores
  • Updated the integrated NetBird component to a newer version.

[coderabbitai]

📝 Walkthrough

Walkthrough

The netbird git submodule reference is updated from commit 3aa6c02b... to 8a43f4f....

Changes

Netbird submodule update

Layer / File(s)	Summary
Update submodule pointer netbird	The tracked netbird commit changes to a newer pinned revision.

Estimated code review effort: 1 (Trivial) | ~2 minutes

Possibly related PRs

• netbirdio/android-client#217: Updates the same netbird submodule reference.
• netbirdio/android-client#218: Performs the same type of submodule commit bump.
• netbirdio/android-client#219: Only changes the netbird submodule pointer.

Suggested reviewers: pappz

Poem

A bunny hops through commits bright,
The submodule points to newer light.
One tiny pointer, neatly spun,
A fresh revision joins the run.
Hop, hop—review’s nearly done!

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly matches the change: updating the netbird submodule to version v0.75.1.

✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch bump-netbird-0.75.1

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