Support for Python 3.12 (#1317)

* support for Python 3.12

* add python 3.12 to workflows

* version string fix

* retrieval chat

* teachability

* workflow

* redistribute notebook tests

* fix incorrect notebook introduction

* update banner; remove unused imports; update openai workflow

---------

Co-authored-by: Chi Wang <wang.chi@microsoft.com>

notebook/agentchat_function_call_async.ipynb

@@ -15,7 +15,7 @@
    "id": "9a71fa36",
    "metadata": {},
    "source": [
-    "# Auto Generated Agent Chat: Task Solving with Provided Tools as Functions\n",
+    "# Auto Generated Agent Chat: Task Solving with Provided Tools as Functions (Asynchronous Function Calls)\n",
     "\n",
     "AutoGen offers conversable agents powered by LLM, tool, or human, which can be used to perform tasks collectively via automated chat. This framework allows tool use and human participation through multi-agent conversation. Please find documentation about this feature [here](https://microsoft.github.io/autogen/docs/Use-Cases/agent_chat).\n",
     "\n",
@@ -23,9 +23,9 @@
     "\n",
     "## Requirements\n",
     "\n",
-    "AutoGen requires `Python>=3.8`. To run this notebook example, please install the [mathchat] option since we will import functions from `MathUserProxyAgent`:\n",
+    "AutoGen requires `Python>=3.8`. To run this notebook example, please install `pyautogen`:\n",
     "```bash\n",
-    "pip install \"pyautogen[mathchat]\"\n",
+    "pip install pyautogen\n",
     "```"
    ]
   },
@@ -36,7 +36,7 @@
    "metadata": {},
    "outputs": [],
    "source": [
-    "# %pip install \"pyautogen[mathchat]~=0.1.0\""
+    "# %pip install \"pyautogen>=0.2.6\""
    ]
   },
   {
@@ -390,7 +390,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.10.13"
+   "version": "3.11.5"
   }
  },
  "nbformat": 4,