Increase max instances (google#2053)

Increase the max instance count, default is 100.

We are currently running into the max instance count (or almost running
into it, there is 97 instances running at the moment).

Author: another-rex

deployment/clouddeploy/osv-api/run.yaml

@@ -4,6 +4,9 @@ metadata:
   name: osv-grpc-backend
 spec:
   template:
+    metadata:
+      annotations:
+        autoscaling.knative.dev/maxScale: '300'
     spec:
       containers:
       - image: osv-server