Release of Az.Accounts 2.1.0 violates Major Version Semantic Versioning rules for Az 4.*, Az 3.*

## Description

Az 5.0.0 major version release includes the new major version release of Az.Accounts 2.1.0 with [breaking changes](https://github.com/Azure/azure-powershell/releases/tag/v5.0.0-October2020).

Az [4.8.0](https://www.powershellgallery.com/packages/Az/4.8.0) and [3.8.0](https://www.powershellgallery.com/packages/Az/3.8.0) will absorb the major version breaking changes of Az.Accounts 2.1.0 as those modules do not pin to the 1.x major version of Az.Accounts. Package Details indicate >= for Az.Accounts.

The consequence is that
* Installing 3.8.0 or 4.8.0 of Az is now _breaking_ as the latest version of Az.Accounts (2.*) is now installed instead of 1.x.
* Pinning to 3.8.0 or 4.8.0 of Az will still invite breakages in existing automation

This violates SemVer versioning rules for [minor versions](https://semver.org/).

## Steps to reproduce

```powershell
Install-Module Az -RequiredVersion 4.8.0 -Force -Verbose -Repository PSGallery
```

```powershell
VERBOSE: Downloading 'https://www.powershellgallery.com/api/v2/package/Az.Accounts/2.1.0'.
VERBOSE: Completed downloading 'https://www.powershellgallery.com/api/v2/package/Az.Accounts/2.1.0'.
VERBOSE: Completed downloading 'Az.Accounts'.
```