invoice-ninja: Update PVC for restored backup

The Longhorn volume for the *invoice-ninja* PVC got into a strange state
following an unexpected shutdown this morning.  One of its replicas
seemed to have disappeared, and it also thought that the size had
changed.  As such, it got stuck in "expanding" state, but it was not
actually being expanded.  This issue is described in detail in the
Longhorn documentation: [Troubleshooting: Unexpected expansion leads to
degradation or attach failure][0].  Unfortunately, there is no way to
recover a volume from that state, and it must be deleted and recreated
from backup.  This changes some of the properties of the PVC, so they
need to be updated in the manifest.

[0]: https://longhorn.io/kb/troubleshooting-unexpected-expansion-leads-to-degradation-or-attach-failure/

invoice-ninja/invoice-ninja.yaml

@@ -12,7 +12,8 @@ spec:
   - ReadWriteMany
   resources:
     requests:
-      storage: 1Gi
+      storage: 3816Mi
+  storageClassName: longhorn-static
 
 ---
 apiVersion: v1