chore: bump toolbox to v0.15.0

[pau-hedgehog]

Picks up githedgehog/toolbox#44, bounding iperf3's results-exchange JSON_read so a server-side abort no longer masks as client ENOMEM.

See #1746.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: e88bc5a6-8cff-4ebb-a01b-00de481b18d5

📥 Commits

Reviewing files that changed from the base of the PR and between 58a74b0 and f314436.

📒 Files selected for processing (1)

• pkg/fab/versions.go

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📝 Walkthrough

Walkthrough

The platform Toolbox version declaration changes from v0.14.0 to v0.15.0.

Changes

Toolbox version update

Layer / File(s)	Summary
Update Toolbox declaration pkg/fab/versions.go	The declared platform Toolbox version changes to v0.15.0.

Suggested reviewers: frostman

Merge Risk: ⚪ Minimal · up to f3144

This is a narrowly scoped toolbox version bump with no actionable merge-blocking risk remaining beyond normal checks and review.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and concisely describes the main change: updating the Toolbox version to v0.15.0.
Description check	✅ Passed	The description relates directly to the Toolbox update and identifies the included iperf3 behavior change and related issue.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 1…
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.

Full details: Docstring Coverage

Explanation

No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 1 files.

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_{Comment @coderabbitai help to get the list of available commands.}

[Frostman]

Done in #2026