Update @microsoft.azure/autorest.csharp to remove dependency of legacy dotnet (Azure#34978)

* Update @microsoft.azure/autorest.csharp to target .net 6

* Upgrade to latest version

Author: live1206

swagger_to_sdk_config.json

@@ -12,7 +12,7 @@
       "reflect-api-versions": "",
       "license-header": "MICROSOFT_MIT_NO_VERSION",
       "sdkrel:csharp-sdks-folder": "./sdk",
-      "use": "@microsoft.azure/[email protected].82"
+      "use": "@microsoft.azure/[email protected].101"
     },
     "advanced_options": {
       "create_sdk_pull_requests": true,