releases/lts: correct v3.28 last minor

Right now, the no longer maintained table suggests that the last release
for the 3.28 LTS was 3.28.11. This is incorrect, as 3.28.12 was released
in May of 2023. Let's update this table to reflect that.

Author: Geodewd549

app/templates/releases/lts.hbs

@@ -98,8 +98,8 @@
     </tr>
     <tr>
       <td>3.28</td>
-      <td>3.28.11</td>
-      <td>November 2022</td>
+      <td>3.28.12</td>
+      <td>May 2023</td>
     </tr>
     <tr>
       <td>3.24</td>