Update to ACK runtime v0.56.0, code-generator v0.56.0 (#56)

### 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 `v1.1.3` to `v1.2.0`

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

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

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

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

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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