Update info on financial sponsors page

This updates the dates of the sponsorships, and moves to a
different date format based on discussion from PGCA board.

Author: jkatz

templates/sponsors/financial.html

@@ -70,7 +70,7 @@ <h3>PostgreSQL Community Association Sponsors</h3>
         </a>
       </th>
       <td><a href="https://www.enterprisedb.com" target="_blank" rel="noopener">EDB</a></td>
-      <td>24th January 2025</td>
+      <td>January 2025</td>
       <td>Benefactor</td>
     </tr>
     <tr>
@@ -80,7 +80,7 @@ <h3>PostgreSQL Community Association Sponsors</h3>
         </a>
       </th>
       <td><a href="https://aws.amazon.com" target="_blank" rel="noopener">AWS</a></td>
-      <td>19th July 2024</td>
+      <td>July 2025</td>
       <td>Benefactor</td>
     </tr>
   </tbody>