fix: Fix download of build artifacts on relese workflow

[Blackhex]

After update, the actions/download-artifact do not place the downloaded artifacts to build-artifacts folder as before. This PR sets the location of the artifact explicitly. Furthermore, it requests only the build-artifacts artifact which removes warning.

Fix validated by https://github.com/Blackhex/a2a-dotnet/actions/runs/17468209270

[Copilot]

Pull Request Overview

This PR fixes the download location of build artifacts in the GitHub release workflow by explicitly configuring the actions/download-artifact action. The update addresses a breaking change where the action no longer automatically places artifacts in the expected build-artifacts folder.

• Adds explicit name and path configuration to three download-artifact steps
• Sets the download path to ${{ github.workspace }}/build-artifacts for consistency
• Specifies build-artifacts as the target artifact name to eliminate warnings

Comments suppressed due to low confidence (1)

.github/workflows/release.yaml:1

• There's a typo in the title: 'relese' should be 'release'.

# Publish new package versions of A2A .NET SDK

---

_{Tip: Customize your code reviews with copilot-instructions.md. Create the file or learn how to get started.}