feat(blog): create post for v26.3.0

[github-actions]

Creates a new blog post for v26.3.0

Check this workflow's logs at https://github.com/nodejs/nodejs.org/actions/runs/26757015443.

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Project	Deployment	Actions	Updated (UTC)
nodejs-org	Ready	Preview	Jun 1, 2026 5:40pm

[cursor]

PR Summary

Low Risk
Content-only addition following the established release-post pattern; no runtime or build behavior changes.

Overview
Adds a new English release blog post at apps/site/pages/en/blog/release/v26.3.0.md for Node.js 26.3.0 (Current), dated 2026-06-01, using the standard release post front matter (category: release, layout: blog-post).

The post mirrors prior release pages: a Notable Changes section (macOS universal binary availability notice plus semver-minor highlights such as Buffer.poolSize, httpValidation, inspector coverage, and permission.drop), a full Commits changelog, download links for all platforms, and PGP-signed SHASUMS. No application or site logic is modified—only this documentation/content file is introduced.

^{Reviewed by Cursor Bugbot for commit fdd6ef6. Bugbot is set up for automated code reviews on this repo. Configure here.}

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 73.24%. Comparing base (c582f6e) to head (fdd6ef6).
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #8933   +/-   ##
=======================================
  Coverage   73.24%   73.24%           
=======================================
  Files         102      102           
  Lines        8640     8640           
  Branches      316      316           
=======================================
  Hits         6328     6328           
  Misses       2311     2311           
  Partials        1        1           

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