.Net: fix: make compatible with YamlDotNet 16.x, update package ref to 16.3.0

[jphorv-bdo]

Motivation and Context

Fixes issue #9501

YamlDotNet released version 16.0.0 on 7/14/2024 which included a breaking change to an interface implemented by Microsoft.SemanticKernel.Yaml.

M.SK.Yaml's dependency on YamlDotNet has a minimum version 15.3.0 but no upper bound.

Any project/solution where the effective YamlDotNet version is >= 16 which uses M.SK.Yaml results in a runtime TypeLoadException as described in #9501.

Description

Changes:

1. bump the YamlDotNet dependency from 15.3.0 to the latest (16.3.0)
2. adjust 2 method signatures to be compatible with the YamlDotNet 16x interface.

Contribution Checklist

• The code builds clean without any errors or warnings
• The PR follows the SK Contribution Guidelines and the pre-submission formatting script raises no violations
• All unit tests pass, and I have added new tests where possible
• I didn't break anyone 😄

[jphorv-bdo]

@microsoft-github-policy-service agree company="BDO USA, P.C."

[valuespace-ai]

This is still an issue with the latest stable version 1.55.