chore: Replace k8s v1.28.0-rc.1 with k8s 1.28.3 support (#89)

## Description
<!-- Please include a summary of the change in your PR and what it's
fixing. -->
Update k8s version to latest supported version. 

## Type of change
<!-- Please check the relevant option. -->

- [ ] Breaking change (fix or feature that would cause existing
functionality to not work as expected)
- [x] New feature / enhancement (non-breaking change which adds
functionality)
- [ ] Security fix
- [ ] Bug fix (non-breaking change which fixes an issue)

## Checklist:
<!-- Please check applicable options. -->

- [ ] Add changelog entry following the [contributing
guide](../CONTRIBUTING.md#pull-requests)
- [ ] Documentation has been updated
- [ ] This change requires changes in testing:
  - [ ] unit tests
  - [ ] E2E tests

CHANGELOG.md

@@ -7,6 +7,9 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 
 ## Unreleased
 
+### enhancement
+- Add full k8s 1.28 support by @svetlanabrennan in [#89](https://github.com/newrelic/newrelic-k8s-operator/pull/89)
+
 ## v0.4.0 - 2023-10-30
 
 ### 🛡️ Security notices

Makefile

@@ -15,7 +15,7 @@ IMAGE_TAG_BASE ?= newrelic/newrelic-k8s-operator
 # Image URL to use all building/pushing image targets
 IMG ?= newrelic/newrelic-k8s-operator
 # ENVTEST_K8S_VERSION refers to the version of kubebuilder assets to be downloaded by envtest binary.
-ENVTEST_K8S_VERSION = 1.27.5
+ENVTEST_K8S_VERSION = 1.28.3
 
 # Get the currently used golang install path (in GOPATH/bin, unless GOBIN is set)
 ifeq (,$(shell go env GOBIN))