Preparation of release 9.0.3

[ckadluba]

• Updated Serilog core package to 4.3.1
• Updated CHANGES.md

[Copilot]

Pull request overview

This PR prepares version 9.0.3 for release by updating the Serilog core dependency to the latest patch version and documenting all changes included in this release. The changes being released in 9.0.3 include bug fixes for UTC timestamp handling and TraceId/SpanId storage, implementation of DataLength presets for LevelColumn, an update to Serilog 4.3.1, and the addition of .NET 10 as a target framework.

Changes:

• Updated Serilog dependency from version 4.3.0 to 4.3.1
• Added release notes for version 9.0.3 documenting all features and fixes

Reviewed changes

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

File	Description
Directory.Packages.props	Updated Serilog package version from 4.3.0 to 4.3.1 in centralized package management
CHANGES.md	Added version 9.0.3 release notes documenting bug fixes, feature implementations, and framework updates

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