build: pin fbuild 2.5.37 for ESP32-C2 and H2

[zackees]

Fixes #4687. Pins the released fbuild 2.5.37, which repairs the packaged ESP32-C2/H2 Bluetooth header paths and drops the unsupported C++ atexit flag for their SDK. Both Blink builds pass locally using the published wheel. The fbuild source fix passed its CI and was merged in FastLED/fbuild#1651; its exact-SHA release dry run and publish run both passed.

Summary by CodeRabbit

• Bug Fixes
  • Improved build compatibility for ESP32-C2/H2 Bluetooth headers and GCC 14 SDKs.

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ℹ️ Recent review info

⚙️ Run configuration

• Configuration used: Repository: FastLED/FastLED/.coderabbit.yaml
• Review profile: CHILL
• Plan: Advanced
• Run ID: 0226878d-0f6e-4f75-af88-f296f59381ca

📥 Commits

Reviewing files that changed from the base of the PR and between 367602a and 496af68.

📒 Files selected for processing (1)

• pyproject.toml

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📝 Walkthrough

Walkthrough

The fbuild dependency pin changes from 2.5.36 to 2.5.37. The pin-history comments describe repairs and a compiler flag change associated with version 2.5.37.

Changes

fbuild dependency pin

Layer / File(s)	Summary
Update fbuild pin pyproject.toml	The dependency pin changes to 2.5.37. The pin-history comments describe ESP32-C2/H2 Bluetooth header-layout repairs and removal of -fuse-cxa-atexit for GCC 14 SDKs.

Priority: ➖ Normal

Estimated code review effort: 1 (Trivial) | ~3 minutes

Change: Bug fix · Severity of issue fixed: Medium

Merge Risk: ⚪ Minimal · up to 496af

The updated fbuild version is available for the project’s declared platforms, and no specific build regression is identified. No merge blocker is established.

Architecture Summary

Architecture risk: 🔵 Low · up to 496af

The change affects 1 system.

Changed systems: pyproject.toml

Architecture concerns
No architecture-level concerns identified.

Review details

Systems and components

• observed — pyproject.toml (service) was modified; 1 changed file maps to changed impact.

Before / after behavior

• observed — Modified behavior in pyproject.toml: The pin-history comments replace the 2.5.36 compatibility note with a 2.5.37 entry describing C2/H2 Bluetooth header-layout repairs and removal of -fuse-cxa-atexit for GCC 14 SDKs.
• observed — Modified behavior in pyproject.toml: The pinned fbuild dependency changes from version 2.5.36 to 2.5.37.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly states the fbuild version pin and the ESP32-C2 and H2 targets, which summarize the main change.
Linked Issues check	✅ Passed	Issue #4687 is closed, so it supplies historical context only and creates no active coding requirements for this pull request.
Out of Scope Changes check	✅ Passed	The whole-PR diff only updates the fbuild pin and its history comments in pyproject.toml. The fbuild 2.5.37 entry ties the C2/H2 header-layout repair and atexit flag change to this pull request’s stat…
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 0…

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