Updating supported kind versions (#2783)

Author: jdewinne

docs/vendor/testing-supported-clusters.md

@@ -21,7 +21,7 @@ Compatibility Matrix supports creating [kind](https://kind.sigs.k8s.io/) cluster
   </tr>
   <tr>
     <th>Supported Kubernetes Versions</th>
-    <td>1.25.16, 1.26.15, 1.27.16, 1.28.13, 1.29.8, 1.30.4, 1.31.0</td>
+    <td>1.25.16, 1.26.15, 1.27.16, 1.28.13, 1.29.8, 1.30.4, 1.31.1</td>
   </tr>
   <tr>
     <th>Supported Instance Types</th>