[bugfix] fix f-string for error

[prashantgupta24]

Fix f-string for error

After fix:
OSError: Found 0 files matching the pattern: re.compile('^tokenizer\\.model\\.v.*$|^tekken\\.json$'). Make sure that a Mistral tokenizer is present in ['README.md', 'config.json', 'generation_config.json', 'model-00001-of-00002.safetensors', 'model-00002-of-00002.safetensors', 'model.safetensors.index.json', 'pytorch_model.bin.index.json', 'special_tokens_map.json', 'tokenizer.json', 'tokenizer.model', 'tokenizer_config.json'].

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[github-actions]

👋 Hi! Thank you for contributing to the vLLM project.
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[prashantgupta24]

@simon-mo sorry I updated the PR after you approved it. Let me know if it still looks good. Thanks!