fix: slack test failure

[amithad]

update_examples_version

[Copilot]

Pull Request Overview

This PR updates the agentkernel dependency from version 0.2.2 to 0.2.3 across all example projects. The update introduces a new dependency singleton-type (version 0.0.5) and makes a minor code change to formalize the abstract base class pattern in the REST request handler.

Key changes:

• Updated agentkernel dependency from 0.2.2 to 0.2.3 across all examples
• Added singleton-type (0.0.5) as a new transitive dependency
• Modified RESTRequestHandler to explicitly inherit from ABC

Reviewed Changes

Copilot reviewed 18 out of 35 changed files in this pull request and generated no comments.

File	Description
Multiple pyproject.toml files	Updated agentkernel version requirement from >=0.2.2 to >=0.2.3
Multiple uv.lock files	Updated lock files with new agentkernel version, hashes, and added singleton-type dependency
ak-py/src/agentkernel/api/rest_request_handler.py	Added explicit ABC inheritance and import for RESTRequestHandler class

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