Use autogen version 0.9.1a1 and update fastagency to version 0.9.1a1

[kumaranvpl]

Description

Type of change

• Documentation (typos, code examples, or any documentation updates)
• Bug fix (a non-breaking change that resolves an issue)
• New feature (a non-breaking change that adds functionality)
• Breaking change (a fix or feature that would disrupt existing functionality)
• This change requires a documentation update

Checklist

• I have conducted a self-review of my own code
• I have made the necessary changes to the documentation
• My changes do not generate any new warnings
• I have added tests to validate the effectiveness of my fix or the functionality of my new feature
• I have included code examples to illustrate the modifications

[Copilot]

Pull Request Overview

This PR updates the version of the autogen dependency and the fastagency package to 0.9.1a1 to ensure compatibility with the latest release features.

• Update dependency in pyproject.toml from "ag2==0.9.0" to "ag2==0.9.1a1"
• Update the version string in fastagency/about.py to "0.9.1a1"

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
pyproject.toml	Updated the autogen dependency version
fastagency/about.py	Updated the package version string