chore: bump zccache 1.11.15 -> 1.11.20

[zackees]

Refresh the Python floor + uv.lock to pick up zccache fixes shipped since 1.11.15:

• feat(packages): hoist platform_packages override into PackageBase so the fix propagates to all 16 orchestrators (impl follow-up to #664) #681 depgraph eviction fix → no more wasted hits when artifact GC fires (1.11.19) — directly relevant to fbuild's warm-build workloads.
• fbuild-serial: vendor a serial-probe CLI + shared BOARD_FINGERPRINTS table (companion to closed #684, parallel to FastLED #3339) #686ZCCACHE_DIAG_CWD diagnostic (1.11.17) — useful for fbuild's Windows CWD audit work.
• audit: ch32v — does platform_packages override work? (parent #664) #670 back-pressure groundwork (1.11.19).
• audit: stm32 / framework-arduinoststm32 — does platform_packages override work? (parent #664) #679 cached-stderr cross-worktree docs (1.11.20).
• fbuild-serial: hard_reset_blocking leaves DTR=low — fatal for CDC-ACM bridges (LPC11U35, FTDI CDC). Mirror the FastLED #3300/#3339 lessons. #684 feature comparison matrix (1.11.20).
• audit: silabs / framework-arduinosilabs — does platform_packages override work? (parent #664) #678 CLI lost-connection message cleanup (1.11.16).

uv lock --upgrade-package zccache regenerated the lockfile cleanly. No code changes.

🤖 Generated with Claude Code

Summary by CodeRabbit

• Chores
  • Updated internal dependencies to maintain compatibility and stability.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

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📥 Commits

Reviewing files that changed from the base of the PR and between 6a988dc and f9b9307.

⛔ Files ignored due to path filters (1)

• uv.lock is excluded by !**/*.lock

📒 Files selected for processing (1)

• pyproject.toml

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📝 Walkthrough

Walkthrough

The PR updates the zccache dependency minimum version requirement from 1.11.15 to 1.11.20 in pyproject.toml. This is a straightforward version constraint bump with no other changes to project configuration or metadata.

Changes

Dependency Version Update

Layer / File(s)	Summary
Zccache version constraint update pyproject.toml	The minimum version of the zccache dependency in [project].dependencies is updated from >=1.11.15 to >=1.11.20.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Possibly related PRs

• FastLED/fbuild#416: Bumps zccache dependency constraint in the same pyproject.toml entry.
• FastLED/fbuild#418: Also updates the zccache minimum version in project dependencies.
• FastLED/fbuild#48: Updates zccache version constraint in the same configuration file.

Poem

🐰 A version bump, so small and neat,
Zccache gets an upgrade sweet,
From fifteen to twenty we climb,
Dependencies fresh, right on time! ✨

🚥 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 and specifically describes the main change: bumping the zccache dependency version from 1.11.15 to 1.11.20, which matches the single file modification in the changeset.
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.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch chore/zccache-1.11.20

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