chore: update pypdf version to 6.3.0 and adjust dependency constraints in pyproject.toml

Author: dragos199993

poetry.lock

@@ -28,7 +28,7 @@ langchain-cohere = { version = ">=0.4.3", optional = true }
 requests = ">=2.31"
 urllib3 = ">=2.5.0"
 transformers = { version = ">=4.53.0", optional = true }
-pypdf = { version = ">=6.0.0", optional = true }
+pypdf = { version = ">=6.1.3", optional = true }
 openai = { version = ">=1.66.3", optional = true }
 optuna = { version = "^4.1.0", optional = true }
 ragas = { version = "^0.2.6", optional = true }