Use langversion 11

[jennyf19]

Microsoft.Identity.Web Library

Microsoft.Identity.Web

Microsoft.Identity.Web version

latest

Web app

Not Applicable

Web API

Not Applicable

Token cache serialization

Not Applicable

Description

https://github.com/AzureAD/microsoft-identity-web/blob/master/Directory.Build.props#L69

langver 11 has fewer allocations

https://learn.microsoft.com/en-us/dotnet/csharp/language-reference/configure-language-version#defaults

Reproduction steps

n/a

Error message

No response

Id Web logs

No response

Relevant code snippets

n/a

Regression

No response

Expected behavior

n/a