Refa: Update base64 test image with new sample data (#9115)

### What problem does this PR solve?

Replace the placeholder test image in base64_image.py with a new sample
image data string.

### Type of change

- [x] Refactoring
This commit is contained in:
Liu An
2025-07-30 14:34:26 +08:00
committed by GitHub
parent 391c5586dd
commit ffff5c2e8c

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