Update all dependencies

[friggeri]

This aggregates all the dependabot PRs into one for ease of landing them

[Copilot]

Pull request overview

This PR updates multiple dependencies across the repository's JavaScript/TypeScript and .NET projects, as well as GitHub Actions workflow dependencies.

Changes:

• Updated Node.js type definitions and testing frameworks across test harness and SDK packages
• Updated .NET SDK and testing packages to newer versions
• Updated GitHub Actions workflow action versions for consistency review and issue triage workflows

Reviewed changes

Copilot reviewed 6 out of 8 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
test/harness/package.json	Updated @types/node from 25.1.0 to 25.2.0 and vitest from 4.0.16 to 4.0.18
nodejs/package.json	Updated @types/node to 25.2.0, TypeScript ESLint packages to 8.54.0, esbuild to 0.27.2, and vitest to 4.0.18
dotnet/test/GitHub.Copilot.SDK.Test.csproj	Updated Microsoft.NET.Test.Sdk to 18.0.1 and coverlet.collector to 6.0.4
dotnet/src/GitHub.Copilot.SDK.csproj	Updated Microsoft.Extensions.AI.Abstractions to 10.2.0, Microsoft.Extensions.Logging.Abstractions to 10.0.2, and System.Text.Json to 10.0.2
.github/workflows/sdk-consistency-review.lock.yml	Updated githubnext/gh-aw/actions/setup from v0.38.2 to v0.39.4 across multiple job steps
.github/workflows/issue-triage.lock.yml	Updated githubnext/gh-aw/actions/setup from v0.38.2 to v0.39.4 across multiple job steps

Files not reviewed (2)

• nodejs/package-lock.json: Language not supported
• test/harness/package-lock.json: Language not supported

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