Update to ACK runtime v0.56.0, code-generator v0.56.0 (#162)

### 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 `v1.6.1` to `v1.7.0`

Once this PR is merged, release `v1.7.0` will be automatically created for `dynamodb-controller`

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

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

```
building ack-generate ... ok.
==== building dynamodb-controller ====
Copying common custom resource definitions into dynamodb
Building Kubernetes API objects for dynamodb
Generating deepcopy code for dynamodb
Generating custom resource definitions for dynamodb
Building service controller for dynamodb
Running GO mod tidy
Generating RBAC manifests for dynamodb
Running gofmt against generated code for dynamodb
Updating additional GitHub repository maintenance files
==== building dynamodb-controller release artifacts ====
Building release artifacts for dynamodb-v1.7.0
Generating common custom resource definitions
Generating custom resource definitions for dynamodb
Generating RBAC manifests for dynamodb
```

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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