This PR prepares the release 1.16.0.

Summary by cubic

Prepares the axios 1.16.0 release. Bumps version constants and package metadata; no functional changes.

Changes

• Set VERSION to 1.16.0 in lib/env/data.js
• Update package.json and package-lock.json to 1.16.0
• Minor contributor list reordering (no behavior impact)

Impact

• Docs: Update /docs/ to reference 1.16.0 and add release notes if needed
• Testing: No tests added or changed; not needed for a version bump
• Semantic version: Minor release (1.16.0), no breaking changes

^{Written for commit a75daf5. Summary will update on new commits.}