Azure/PSRule.Rules.Azure v1.20.0-B0028 on GitHub

What's changed since pre-release v1.20.0-B0004:

New rules:
- AKS:
  - Check clusters use Ephemeral OS disk by @bengeset96.
    #1618
- CDN:
  - Check CDN profile uses Front Door Standard or Premium tier by @bengeset96.
    #1612
- VMSS:
  - Check Linux VMSS has disabled password authentication by @bengeset96.
    #1635
Updated rules:
- Azure Kubernetes Service:
  - Updated Azure.AKS.Version to use latest stable version 1.23.8 by @BernieWhite.
    #1627
    - Use AZURE_AKS_CLUSTER_MINIMUM_VERSION to configure the minimum version of the cluster.
- Event Grid:
  - Promoted Azure.EventGrid.DisableLocalAuth to GA rule set by @BernieWhite.
    #1628
- Key Vault:
  - Promoted Azure.KeyVault.AutoRotationPolicy to GA rule set by @BernieWhite.
    #1629
Engineering:
- Bump PSRule to v2.4.0.
  #1620
- Updated provider data for analysis.
  #1605
Bug fixes:
- Fixed function dateTimeAdd errors handling utcNow output by @BernieWhite.
  #1637
- Fixed inconclusive failure of Azure.Deployment.AdminUsername by @BernieWhite.
  #1631