Bump memory limits for the operator controller-manager pod

Starting OCP 4.16, the current set limits need to be bumped
to prevent them getting OOMKilled, e.g.:

NAME                                                              CPU(cores)   MEMORY(bytes)
swift-operator-controller-manager-6764c568ff-r4mzl                2m           468Mi
telemetry-operator-controller-manager-7c4fd577b4-9nnvq            2m           482Mi

The reason for this is probably due to the move to cgroups v2.
OCP 4.16 release notes:
~~~
Beginning with OpenShift Container Platform 4.16, Control Groups
version 2 (cgroup v2), also known as cgroup2 or cgroupsv2, is enabled
by default for all new deployments, even when performance profiles
are present.Since OpenShift Container Platform 4.14, cgroups v2 has
been the default, but the performance profile feature required the
use of cgroups v1. This issue has been resolved.
~~~

Upstream memory increase discussion:
kubernetes/kubernetes#118916

While im mentiones its only node memory stats thats are wrong and
pod stats are correct, its probably related.

Resolves: https://issues.redhat.com/browse/OSPRH-8379

Signed-off-by: Martin Schuppert <[email protected]>

config/manager/manager.yaml

@@ -65,9 +65,9 @@ spec:
         resources:
           limits:
             cpu: 500m
-            memory: 256Mi
+            memory: 768Mi
           requests:
             cpu: 10m
-            memory: 128Mi
+            memory: 512Mi
       serviceAccountName: controller-manager
       terminationGracePeriodSeconds: 10