release: 3.3.2 → 3.3.3 — verification bump to test the "Check now" flow end-to-end

Pure version increment with no functional changes. Lets David's
Local install (currently on v3.3.2) hit the "Check now" button in
Settings → Updates and verify the panel correctly reports a real
version delta — should render "v3.3.3 available — Download .zip"
with a working download link to the source archive on Gitea.

After the test passes, `git pull` brings the local install to
v3.3.3 and the same panel should flip back to "You are up to date
(v3.3.3)".

VERSION
- wp-notes.php header 3.3.2 → 3.3.3
- WP_NOTES_VERSION constant 3.3.2 → 3.3.3
- About page version-history leads with v3.3.3 as latest (with a
  cheeky "if you can see this line, you successfully pulled the
  test release" note); v3.3.2 demoted to previous entry.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

CHANGELOG.md

@@ -9,6 +9,19 @@ Format: [Keep a Changelog 1.1.0](https://keepachangelog.com/en/1.1.0/) — versi
 
 ---
 
+## [3.3.3] — 2026-05-25
+
+**Verification bump.** Pure version increment to test the end-to-end
+"Check now" flow against the now-publicly-hosted Gitea repo. No
+functional changes. David's Local install (running v3.3.2) should
+now see *"v3.3.3 available — Download .zip"* in the Settings →
+Updates panel once "Check now" is clicked, confirming the update
+mechanism works against a real version delta. After the test, he
+can `git pull` to land on v3.3.3 and watch the same panel flip back
+to *"You are up to date (v3.3.3)"*.
+
+---
+
 ## [3.3.2] — 2026-05-25
 
 ### Fixed — update checker now works with tag-only workflows