Unpin s3transfer

Author: hmstepanek

tox.ini

@@ -260,7 +260,6 @@ deps =
     external_botocore-botocorelatest: botocore
     external_botocore-botocorelatest: boto3
     external_botocore-botocorelatest: langchain
-    external_botocore-botocorelatest: s3transfer<0.8.1
     external_botocore-botocore128: botocore<1.29
     external_botocore-botocore0125: botocore<1.26
     external_botocore-{py38,py39,py310,py311,py312}: moto