chore(deps): update rust toolchain to 87ffb7f

[renovate]

This PR contains the following updates:

Package	Update	Change
rust-overlay	digest	e9d12b9 → 87ffb7f

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[mergify]

Merge Queue Status

• ✅ Entered queue — 2026-10-15 23:11 UTC · Rule: default · triggered by rule Queue explicitly requested merges
• ✅ Checks passed · on draft merge queue: checking #1302 on master (b48dbb1) #1325
• ✅ Merged — 2026-10-15 23:59 UTC · at 6f1328b046106008548f5d267cec9cf83475d243 · merge

This pull request spent 48 minutes 11 seconds in the queue, including 45 minutes 51 seconds running CI.

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