chore(deps): update rust to nightly-2026-08-09

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
rust (source, changelog)	toolchain	patch	nightly-2026-08-02 → nightly-2026-08-09

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[github-actions]

fspy benchmark

linux

dynamic/launch             change  +1.30%  [ -6.07% ..  +9.11%]  overhead   +54.94%
dynamic/access             change  -0.26%  [-18.20% .. +48.48%]  overhead    +9.05%
dynamic/access-relative    change  +1.73%  [ -9.23% .. +23.13%]  overhead   +50.69%
static/launch              change  +3.49%  [ -9.08% .. +19.14%]  overhead  +157.29%
static/access              change  -0.69%  [ -9.79% ..  +6.79%]  overhead  +830.79%
static/access-relative     change  +0.69%  [ -3.69% ..  +7.51%]  overhead +1325.71%

macos

dynamic/launch             change  +0.41%  [ -3.59% ..  +3.26%]  overhead  +220.48%
dynamic/access             change  -0.26%  [ -6.33% ..  +3.05%]  overhead    +3.56%
dynamic/access-relative    change  +0.57%  [-10.12% ..  +8.68%]  overhead  +248.15%

windows

dynamic/launch             change  -1.35%  [ -8.95% ..  +5.06%]  overhead   +29.39%
dynamic/access             change  +0.00%  [ -0.92% ..  +0.94%]  overhead    +1.51%
dynamic/access-relative    change  -0.18%  [ -1.41% ..  +1.10%]  overhead    +1.48%