fix(books-it): update broken link for 'Analisi e progettazione del so…

[Aaqilyousuf]

What does this PR do?

Add resource(s)

For resources

Description

Updated the broken link for the book "Analisi e progettazione del software – S. Ceschia, A. Schaerf" in the Italian section Metodologie di sviluppo del software. The original link is down, replaced with a stable Wayback Machine archive link.

Why is this valuable (or not)?

Ensures users can access the referenced PDF even though the original hosting site is no longer available.

How do we know it's really free?

The resource was originally publicly available on the University of Udine website. The Wayback Machine preserves the publicly available snapshot.

For book lists, is it a book? For course lists, is it a course? etc.

Yes, it is a book.

Issue

Fixes #11918

Checklist:

• Read our contributing guidelines.
• Search for duplicates.
• Include author(s) and platform where appropriate.
• Put lists in alphabetical order, correct spacing.
• Add needed indications (PDF, access notes, under construction).
• Used an informative name for this pull request.