Add juliankatz as gcp-compute-persistent-disk-csi-driver maintainer and admin

Author: julianKatz

config/kubernetes-sigs/sig-storage/teams.yaml

@@ -50,6 +50,7 @@ teams:
     - amacaskill
     - dannawang0221
     - hime
+    - juliankatz
     - leiyiz
     - mattcary
     - msau42
@@ -69,6 +70,7 @@ teams:
     - dannawang0221
     - hime
     - leiyiz
+    - juliankatz
     - mattcary
     - msau42
     - saad-ali