fix: Update tokenizers version to be compatible with transformers 4.56.0

Transformers 4.56.0 requires tokenizers>=0.22.0, but we had <0.22.
Updated tokenizers constraint from >=0.21,<0.22 to >=0.22,<0.24.

This resolves the dependency conflict that was preventing the build.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

requirements.txt

@@ -23,7 +23,7 @@ pdfplumber>=0.10.0
 torchxrayvision>=0.0.37
 transformers==4.56.0
 datasets>=2.15.0
-tokenizers>=0.21,<0.22
+tokenizers>=0.22,<0.24
 sentencepiece>=0.1.95
 shortuuid>=1.0.0
 tqdm>=4.64.0