chore(release): sync pyproject.toml to 2.3.16 to unblock release-auto

[zackees]

Cargo.toml was bumped to 2.3.16 (in c99579e) but pyproject.toml stayed at 2.3.15, causing every release-auto run since (ecd80c7, dbc2245) to fail in the Prepare-release step's Cargo/pyproject lockstep check.

Downstream: FastLED's fbuild==2.3.15 pin picks up 2.3.16 on the next uv sync, which includes the FastLED-org-transfer ACLPC_CHECKSUM fix from #915 (d08622b). That unblocks FastLED's LPC804/lpc845/lpcxpresso804/lpcxpresso845max build lanes.

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Reviewing files that changed from the base of the PR and between 8a45859 and 1eb54d2.

📒 Files selected for processing (1)

• pyproject.toml

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch chore/release-2.3.16-lockstep-pyproject

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