Update Operator to use Knative 0.16 and increase OLM metadata to 1.10.0

[matzew]

In theory this is done via a few steps:

• [x] Bumping the OLM version to 1.10 (https://github.com/openshift-knative/serverless-operator/pull/438)
• [ ] Updating to knative/client fork version release-0.16 bits
• [ ] Updating to knative/serving fork version release-0.16 bits
• [ ] Updating to knative/eventing fork version release-0.16 bits
• [ ] Updating to knative/operator fork version release-0.16 bits
• [ ] Updating Golang dependencies for Operator to release-0.16 bits

[markusthoemmes]

I believe this is done?