Update ValidateSet for Set-AzWebApp and other WebApp commands to include TLS 1.3

### Description

Currently you can only provide values 1.0-1.2.
Please add a new value to a validateset: 1.3

### Issue script & Debug output

```PowerShell
Set-AzWebApp: Cannot validate argument on parameter 'MinTlsVersion'. The argument "1.3" does not belong to the set "1.0,1.1,1.2" specified by the ValidateSet attribute. Supply an argument that is in the set and then try the command again.
```

### Environment data

```PowerShell
Name Value
---- -----
PSVersion 7.5.1
PSEdition Core
GitCommitId 7.5.1
OS Microsoft Windows 10.0.22631
Platform Win32NT
PSCompatibleVersions {1.0, 2.0, 3.0, 4.0…}
PSRemotingProtocolVersion 2.3
SerializationVersion 1.1.0.1
WSManStackVersion 3.0
```

### Module versions

```PowerShell
ModuleType Version PreRelease Name PSEdition ExportedCommands
---------- ------- ---------- ---- --------- ----------------
Script 14.0.0 Az Core,Desk
```

### Error output

```PowerShell

```