fix: align embedded zccache with soldr

[zackees]

Summary

• align both fbuild embedded zccache dependencies with soldr's _vender/zccache revision
• move from zccache 1.12.14 (4b13676) to 1.12.17 (a16f10e)
• refresh the lockfile so all zccache subcrates use the same revision

This prevents fbuild and soldr from loading different embedded broker implementations on the same host.

Validation

• soldr cargo metadata --locked --no-deps --format-version 1
• git diff --check
• attempted soldr cargo test -p fbuild-build --test zccache_embedded_smoke -- --nocapture and soldr cargo check -p fbuild-build-engine; both were stopped by the local five-minute cold-build cap without compiler or test diagnostics. CI remains the full build/test gate.

Coordinated with zackees/zccache#1213.

Summary by CodeRabbit

• Chores
  • Updated the pinned build-cache dependency revision to a newer version.
  • Applied the same dependency update consistently across build components.

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Review details

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro Plus

Run ID: 936d96bd-a0a0-49b4-b4b1-1b82d00aba80

📥 Commits

Reviewing files that changed from the base of the PR and between 8810d27 and 13ab52d.

⛔ Files ignored due to path filters (1)

• Cargo.lock is excluded by !**/*.lock

📒 Files selected for processing (7)

• crates/fbuild-build-arm/Cargo.toml
• crates/fbuild-build-esp/Cargo.toml
• crates/fbuild-build-mcu/Cargo.toml
• crates/fbuild-cli/src/cli/clean.rs
• crates/fbuild-core/src/process_identity.rs
• crates/fbuild-paths/src/daemon_ownership.rs
• crates/fbuild-serial/src/ports.rs

📝 Walkthrough

Walkthrough

The pull request updates the pinned zccache Git revision in both build-related Cargo manifests while retaining the existing repository URL.

Changes

zccache dependency pin update

Layer / File(s)	Summary
Synchronize zccache revisions crates/fbuild-build/Cargo.toml, crates/fbuild-build-engine/Cargo.toml	Both manifests now pin zccache to revision a16f10e2c3813f0582e0e51eb3b9932c727435f1; the related revision comment is updated.
Estimated code review effort: 1 (Trivial)	~2 minutes

Possibly related PRs

• FastLED/fbuild#981: Updates the same zccache Git dependency pin in crates/fbuild-build/Cargo.toml.

🚥 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 summarizes the main change: aligning embedded zccache with soldr.
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.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/zccache-embedded-version

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