change postgres service name

dezendorf/homelab/k3s/matrix/matrix.yaml

@@ -364,7 +364,7 @@ data:
       public_base: https://matrix-auth.dezendorf.net
       issuer: https://matrix-auth.dezendorf.net
     database:
-      host: postgres
+      host: postgres-mas
       port: 5432
       username: mas_user
       password: "Bee1701Charming1!"