Upgrade experimental package dependencies and use Poetry 1.6.1. (#11339)

Part of upgrading our CI to use Poetry 1.6.1.

libs/experimental/langchain_experimental/pal_chain/base.py

@@ -154,7 +154,13 @@ class PALChain(Chain):
         )
         _run_manager.on_text(code, color="green", end="\n", verbose=self.verbose)
         PALChain.validate_code(code, self.code_validations)
-        repl = PythonREPL(_globals=self.python_globals, _locals=self.python_locals)
+
+        # TODO: look into why mypy thinks PythonREPL's type here is `Any`
+        #       and therefore not callable
+        repl = PythonREPL(
+            _globals=self.python_globals,
+            _locals=self.python_locals,
+        )  # type: ignore[misc]
         res = repl.run(code + f"\n{self.get_answer_expr}", timeout=self.timeout)
         output = {self.output_key: res.strip()}
         if self.return_intermediate_steps: