UPSTREAM PR #18935: chore: Update outdated GitHub Actions versions

[loci-dev]

Mirrored from ggml-org/llama.cpp#18935

Make sure to read the contributing guidelines before submitting a PR

• Updated actions/checkout from v4 to v6 in .github/workflows/build.yml
• Updated actions/checkout from v4 to v6 in .github/workflows/server.yml
• Updated actions/checkout from v4 to v6 in .github/workflows/python-type-check.yml
• Updated actions/checkout from v4 to v6 in .github/workflows/python-lint.yml
• Updated actions/labeler from v5 to v6 in .github/workflows/labeler.yml
• Updated actions/stale from v5 to v10 in .github/workflows/close-issue.yml
• Updated actions/checkout from v4 to v6 in .github/workflows/python-check-requirements.yml
• Updated actions/upload-artifact from v4 to v6 in .github/workflows/build.yml
• Updated docker/login-action from v2 to v3 in .github/workflows/docker.yml
• Updated actions/checkout from v4 to v6 in .github/workflows/update-ops-docs.yml
• Updated actions/checkout from v4 to v6 in .github/workflows/build-cmake-pkg.yml
• Updated actions/checkout from v4 to v6 in .github/workflows/labeler.yml
• Updated actions/cache from v4 to v5 in .github/workflows/build.yml
• Updated actions/download-artifact from v4 to v7 in .github/workflows/build.yml
• Updated actions/checkout from v4 to v6 in .github/workflows/python-lint.yml
• Updated actions/checkout from v4 to v6 in .github/workflows/python-check-requirements.yml
• Updated actions/cache from v4 to v5 in .github/workflows/release.yml
• Updated actions/checkout from v4 to v6 in .github/workflows/build-linux-cross.yml
• Updated actions/checkout from v4 to v6 in .github/workflows/editorconfig.yml
• Updated actions/setup-python from v5 to v6 in .github/workflows/gguf-publish.yml
• Updated actions/checkout from v4 to v6 in .github/workflows/docker.yml
• Updated actions/checkout from v4 to v6 in .github/workflows/server-webui.yml
• Updated actions/upload-artifact from v4 to v6 in .github/workflows/release.yml
• Updated actions/cache from v4 to v5 in .github/workflows/build-linux-cross.yml
• Updated actions/cache from v4 to v5 in .github/workflows/build-cache.yml
• Updated actions/checkout from v4 to v6 in .github/workflows/server-webui.yml
• Updated actions/setup-java from v3 to v5 in .github/workflows/build.yml
• Updated actions/checkout from v4 to v6 in .github/workflows/python-type-check.yml
• Updated actions/github-script from v6 to v8 in .github/workflows/winget.yml
• Updated actions/setup-python from v4 to v6 in .github/workflows/check-vendor.yml
• Updated actions/checkout from v4 to v6 in .github/workflows/copilot-setup-steps.yml
• Updated actions/checkout from v4 to v6 in .github/workflows/update-ops-docs.yml
• Updated actions/setup-node from v4 to v6 in .github/workflows/server-webui.yml

These changes will be tested in the CI pipeline of the pull request.