Add fedora/39 and adjust rawhide

fedora/38 is the current branched release, but it is not yet stable, so
fedora/latest still points to fedora/37. fedora/39 is the new rawhide.

builds.sr.ht/compatibility.md

@@ -427,7 +427,7 @@ Maintainer: Haowen Liu <lhw@lunacd.com>
       <th>Fedora Rawhide</th>
       <th colspan="3" style="font-weight: normal; text-align: center">
         <code>image: fedora/rawhide</code> <strong>or</strong>
-        <code>image: fedora/38</code>
+        <code>image: fedora/39</code>
       </th>
     </tr>
     <tr>
@@ -448,6 +448,32 @@ Maintainer: Haowen Liu <lhw@lunacd.com>
   </tbody>
 </table>
 
+<table class="table table-sm table-hover">
+  <thead>
+    <tr>
+      <th>Fedora 38</th>
+      <th colspan="3" style="font-weight: normal; text-align: center">
+        <code>image: fedora/38</code>
+      </th>
+    </tr>
+    <tr>
+      <th>arch</th>
+      <th style="text-align: center">supported</th>
+      <th style="text-align: center">native</th>
+      <th>updated</th>
+    </tr>
+  </thead>
+  <tbody>
+    <tr><td><code>arch: aarch64</code></td><td style="text-align: center"></td><td></td><td></td></tr>
+    <tr class="table-primary">
+      <td><code>arch: x86_64</code> (default)</td>
+      <td style="text-align: center; color: green">✓</td>
+      <td style="text-align: center; color: green">✓</td>
+      <td>weekly</td>
+    </tr>
+  </tbody>
+</table>
+
 <table class="table table-sm table-hover">
   <thead>
     <tr>
@@ -496,7 +522,7 @@ Maintainer: Haowen Liu <lhw@lunacd.com>
       <td><code>arch: x86_64</code> (default)</td>
       <td style="text-align: center; color: green">✓</td>
       <td style="text-align: center; color: green">✓</td>
-      <td>weekly</td>
+      <td>monthly</td>
     </tr>
   </tbody>
 </table>