fix: fix fixture parsing with lowered async with esbuild 0.25.3

[hi-ogawa]

Description

Esbuild 0.25.3 changed async lowering, so we need to adjust the pattern https://github.com/evanw/esbuild/releases/tag/v0.25.3. I noticed the error on Vite ecosystem ci. https://github.com/vitejs/vite-ecosystem-ci/actions/runs/14787597201/job/41518726162#step:8:1402

CI pass with latest Vite is confirmed https://github.com/vitest-dev/vitest/actions/runs/14788398666/job/41520918643?pr=7921

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