Set secure computing mode to RuntimeDefault (#1360)

Necessary for adhering to the
Restricted Pod Security Standard:
https://kubernetes.io/docs/concepts/security/pod-security-standards/#restricted

Author: waciumawanjohi

config/manager/deployment.yaml

@@ -54,6 +54,8 @@ spec:
             allowPrivilegeEscalation: false
             readOnlyRootFilesystem: true
             runAsNonRoot: true
+            seccompProfile:
+              type: RuntimeDefault
             capabilities:
               drop:
                 - ALL