Update README.md for supported versions (#5387)

Update README.md

Author: gladjohn

README.md

@@ -19,7 +19,7 @@ The following table lists MSAL.NET versions currently supported and receiving se
 
 | Major Version | Last Release | Patch Release Date  | Support Phase|End of Support |
 | --------------|--------------|--------|------------|--------|
-| 4.x           | [![NuGet](https://img.shields.io/nuget/v/microsoft.identity.client.svg?style=flat-square&label=nuget&colorB=00b200)](https://www.nuget.org/packages/Microsoft.Identity.Client/)   |Monthly| Active | Not planned.<br/>✅Supported versions: from 4.61.2 to [![NuGet](https://img.shields.io/nuget/v/microsoft.identity.client.svg?style=flat-square&label=nuget&colorB=00b200)](https://www.nuget.org/packages/Microsoft.Identity.Client/)<br/>⚠️Unsupported versions &lt; `4.61.2`.|
+| 4.x           | [![NuGet](https://img.shields.io/nuget/v/microsoft.identity.client.svg?style=flat-square&label=nuget&colorB=00b200)](https://www.nuget.org/packages/Microsoft.Identity.Client/)   |Monthly| Active | Not planned.<br/>✅Supported versions: from 4.71.2 to [![NuGet](https://img.shields.io/nuget/v/microsoft.identity.client.svg?style=flat-square&label=nuget&colorB=00b200)](https://www.nuget.org/packages/Microsoft.Identity.Client/)<br/>⚠️Unsupported versions &lt; `4.71.2`.|
 
 ### Performance perspectives