chore: Increase memory limit of controller manager (#171) (#173)

Allow up to 600Mi memory consumption, even if only 200Mi get requested
upfront. Only the leader pod might exceed the 200Mi and the real amount
of memory might depend on the environment, therefore adding some buffer.

config/manager/manager.yaml

@@ -64,7 +64,7 @@ spec:
         resources:
           limits:
             cpu: 200m
-            memory: 200Mi
+            memory: 600Mi
           requests:
             cpu: 200m
             memory: 200Mi