chore: Update outdated GitHub Actions versions

[pgoslatara]

Update outdated GitHub Actions so this repo has the latest security fixes and features.

[Copilot]

Pull request overview

This PR updates GitHub Actions workflow dependencies to newer major versions to keep CI builds current with upstream fixes and features.

Changes:

• Bump actions/checkout to v6 across all language workflows.
• Update select language setup actions (e.g., Python/Java/Go) to newer major versions.
• Normalize the .NET workflow file formatting/line endings while updating checkout.

Reviewed changes

Copilot reviewed 13 out of 13 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
.github/workflows/typescript.yml	Update actions/checkout version for TS CI job.
.github/workflows/swift.yml	Update actions/checkout version for Swift CI job.
.github/workflows/rust.yml	Update actions/checkout version for Rust CI job.
.github/workflows/ruby.yml	Update actions/checkout version for Ruby CI job.
.github/workflows/python.yml	Update actions/checkout and actions/setup-python versions.
.github/workflows/kotlin.yml	Update actions/checkout version for Kotlin CI job.
.github/workflows/javascript.yml	Update actions/checkout version for JS CI job.
.github/workflows/java.yml	Update actions/checkout and actions/setup-java versions.
.github/workflows/go.yml	Update actions/checkout and actions/setup-go versions.
.github/workflows/dotnet.yml	Update actions/checkout version and normalize file formatting.
.github/workflows/dart.yml	Update actions/checkout version for Dart CI job.
.github/workflows/cpp.yml	Update actions/checkout version for C++ CI job.
.github/workflows/c.yml	Update actions/checkout version for C CI job.

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[Copilot]

matrix.Java doesn't match the matrix key (java) and GitHub Actions expressions are case-sensitive, so the job name will render without the version. Use matrix.java here.

Suggested change

	name: Java ${{ matrix.Java }} sample
	name: Java ${{ matrix.java }} sample

[Copilot]

This workflow updates actions/checkout to a newer major, but still uses actions/setup-dotnet@v3. Given the PR goal (“Update outdated GitHub Actions versions”), consider bumping setup-dotnet to the intended newer major as well (or note why it must remain on v3).