fix sequential workflow example

add langchain-anthropic to reqs
redo indentation of example

pyproject.toml

@@ -47,6 +47,7 @@ transformers = ">= 4.39.0, <5.0.0"
 asyncio = ">=3.4.3,<4.0"
 langchain-community = "0.0.29"
 langchain-experimental = "0.0.55"
+langchain-anthropic = "*"
 backoff = "2.2.1"
 toml = "*"
 pypdf = "4.3.0"

requirements.txt

@@ -4,6 +4,7 @@ transformers>=4.39.0,<5.0.0
 asyncio>=3.4.3,<4.0
 langchain-community==0.0.29
 langchain-experimental==0.0.55
+langchain-anthropic
 backoff==2.2.1
 toml
 pypdf==4.1.0