test(core): use secure hash algorithm in indexing test to eliminate SHA-1 warning

[mdrxy]

Finish work from #33101

[vercel]

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1 Skipped Deployment

Project	Deployment	Preview	Comments	Updated (UTC)
langchain	Ignored	Preview		Sep 25, 2025 4:45am

[codspeed-hq]

CodSpeed WallTime Performance Report

Merging #33107 will not alter performance

_{Comparing mdrxy/finish-indexing-warnings (113b58b) with master (e97baeb)}

⚠️ Unknown Walltime execution environment detected

Using the Walltime instrument on standard Hosted Runners will lead to inconsistent data.

For the most accurate results, we recommend using CodSpeed Macro Runners: bare-metal machines fine-tuned for performance measurement consistency.

Summary

✅ 13 untouched