downgrade kiota libraries (and graph SDK) to netstandard2.0

[baywet]

The Kiota libraries are currently targeting netstandard2.1, which is not supported by dotnet framework (classic).
This makes for a steep adoption curve for people who have existing projects.
I don't believe we actually need 2.1, I think the history there is that we created the projects with net5.0 at the time, and then downgraded to standard 2.1 when came time to reach public preview.

netstandard2.0 should bring the libs back to compatibility with the framework (classic).

If we're using something specific to 2.1, the alternative would be to multi-target 2.1, and 4.6.2, 4.7.2 and 4.8.

[andrueastman]

Kiota library changes are made via

• Changes target runtime to netstandard2.0 #14
• Changes target runtime to netstandard2.0 kiota-authentication-azure-dotnet#9
• Changes target runtime to netstandard2.0 kiota-serialization-text-dotnet#9
• Changes target runtime to netstandard2.0 kiota-serialization-json-dotnet#9
• Changes target runtime to netstandard2.0 kiota-http-dotnet#14

[baywet]

thanks for taking the time to tackle this.
it seems that during this PR microsoftgraph/msgraph-sdk-dotnet-core#408 we forgot to rev down the standard version. Would you mind pushing another preview for this one so we can roll it all the way to the service lib please?

[andrueastman]

Hey @baywet.
I still have some work to do for the core lib hence microsoftgraph/msgraph-sdk-dotnet-core#408 didn't do the drop.
I'll hopefully close this today then we can close this issue.

[andrueastman]

Graph SDK changes made via

• Changes target runtime to netstandard2.0 microsoftgraph/msgraph-sdk-dotnet-core#411
• Change target runtime to netstandard 2.0 microsoftgraph/msgraph-sdk-dotnet#1315
• Change target runtime to netstandard 2.0 microsoftgraph/msgraph-beta-sdk-dotnet#429

[baywet]

Thanks! Closing as those were merged too!