Fix: replace Java 23 link with archived Wayback URL (original page blank) #12937
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The current link for "Java 23: Key Concepts in Brief — Sergio Petrucci" (https://petrucci.dev/java23.html) loads a blank page. The Wayback Machine has a working capture:
https://web.archive.org/web/20241213171851/https://petrucci.dev/java23.html
This PR updates the entry in books/free-programming-books-langs.md to point to the archived page and adds a short note indicating the original page currently shows blank.
Verified the Wayback capture on 2025-10-30. Fixes #12315.