Merge pull request #7525 from MrHohn/cpa-1.9.0

Promote cluster-proportional-autoscaler:v1.9.0.

Author: k8s-ci-robot

registry.k8s.io/images/k8s-staging-cpa/images.yaml

@@ -8,6 +8,7 @@
     "sha256:69bf675e356770c651864305f2ce17ec25623ac0ff77a040f9396e72daba2d5f": ["v1.8.8"]
     "sha256:7a155604bfa165e1c8a0959d0134ecf4e6151c859355e9256a1d11973faf4ea5": ["v1.8.8-rc.1"]
     "sha256:2c2863bd990298d2aa01c12c3ac76698a5691cf389b419884e62e90407e82cfc": ["v1.8.9"]
+    "sha256:8f3b4e4beb62a9a5ad1ff96712129996e614d1fe7c57739c9816545ecea6f8b6": ["v1.9.0"]
 - name: cluster-proportional-autoscaler-amd64
   dmap:
     "sha256:e310b7e60ed5dabcf9945fb86ee049bafde69b01ac0b9eb647c2b96c273e18d8": ["1.8.2"]