Fix: pin transformers>=4.56.1 and torch>=2.7.0 as required by surya-ocr

Based on surya-ocr pyproject.toml dependencies:
- transformers>=4.56.1 (fixes find_pruneable_heads_and_indices import error)
- torch>=2.7.0

requirements.txt

@@ -1,3 +1,5 @@
 surya-ocr
+transformers>=4.56.1
+torch>=2.7.0
 pillow
 spaces