Update to ACK runtime v0.56.0, code-generator v0.56.0 (#58)

### Update to ACK runtime `v0.56.0`, code-generator `v0.56.0`

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* ACK code-generator `v0.56.0` [release notes](https://github.com/aws-controllers-k8s/code-generator/releases/tag/v0.56.0)
* ACK runtime `v0.56.0` [release notes](https://github.com/aws-controllers-k8s/runtime/releases/tag/v0.56.0)

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NOTE:
This PR increments the release version of service controller from `v1.1.2` to `v1.2.0`

Once this PR is merged, release `v1.2.0` will be automatically created for `route53resolver-controller`

**Please close this PR, if you do not want the new patch release for `route53resolver-controller`**

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#### stdout for `make build-controller`:

```
building ack-generate ... ok.
==== building route53resolver-controller ====
Copying common custom resource definitions into route53resolver
Building Kubernetes API objects for route53resolver
Generating deepcopy code for route53resolver
Generating custom resource definitions for route53resolver
Building service controller for route53resolver
Running GO mod tidy
Generating RBAC manifests for route53resolver
Running gofmt against generated code for route53resolver
Updating additional GitHub repository maintenance files
==== building route53resolver-controller release artifacts ====
Building release artifacts for route53resolver-v1.2.0
Generating common custom resource definitions
Generating custom resource definitions for route53resolver
Generating RBAC manifests for route53resolver
```

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By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

Author: ack-bot

.github/workflows/postsubmit.yaml

@@ -0,0 +1,10 @@
+name: Hydrate Go Proxy
+
+on:
+  push:
+    branches:
+      - main
+
+jobs:
+  call-hydrate-go-proxy:
+    uses: aws-controllers-k8s/.github/.github/workflows/reusable-postsubmit.yaml@main