Add Mastering PostgreSQL 17 book to docs/books

Author: Daniel Gustafsson <[email protected]>
Reported-by: Cornelia Biacsics <[email protected]>
Discussion: https://postgr.es/m/CALaz2ZtraQygtsH_VxQkWEw_ONdXV1bM+QU8+BbJHzHUkg6jHQ@mail.gmail.com

Author: danielgustafsson

media/img/docs/books/mastering_postgresql17.png

@@ -41,6 +41,21 @@ <h1>Books <i class="fas fa-book"></i></h1>
            <strong>Published</strong>: June 2025
         </td>
       </tr>
+      <tr>
+        <td>
+            <a href="https://www.packtpub.com/en-se/product/mastering-postgresql-17-9781836205968">
+              <img src="/media/img/docs/books/mastering_postgresql17.png"
+                   alt="Mastering PostgreSQL 17" /></a>
+        </td>
+        <td>
+           <strong>Title</strong>: Mastering PostgreSQL 17<br />
+           <strong>Author</strong>: Hans-J&uuml;rgen Sch&ouml;nig<br />
+           <strong>Language</strong>: English<br />
+           <strong>Current version at publication</strong>: 17<br />
+           <strong>Format</strong>: Paperback, eBook<br />
+           <strong>Published</strong>: December 2024
+        </td>
+      </tr>
       <tr>
         <td>
             <a href="https://www.packtpub.com/product/postgresql-16-administration-cookbook/9781835460580">