chore: helm 1.3.1

Author: aheckmann

docs/self-hosting/methods/kubernetes.mdx

@@ -21,7 +21,7 @@ Plane Pro and Plane Business are enabled on this edition, so the Free plan on th
 
     - A working Kubernetes cluster
     - `kubectl` and `helm` on the client system that you will use to install our Helm charts
-    - `helm` chart v1.3.0 or later
+    - `helm` chart v1.3.1 or later
 
 ### Procedure