Update global.json (#2776)

* Update global.json

* Updating build

* Fixing version

* Hard code 6.x version

Author: Keboo

.github/actions/build-and-test/action.yml

@@ -14,12 +14,12 @@ runs:
   using: "composite"
   steps:
     - name: Setup .NET
-      uses: actions/setup-dotnet@v1
+      uses: actions/setup-dotnet@v2
       with:
         dotnet-version: | 
           3.1.x
           5.x
-          6.x
+          6.0.301
       env:
         NUGET_AUTH_TOKEN: ${{ inputs.nugetToken }}
 

global.json

@@ -1,6 +1,6 @@
 {
   "sdk": {
-    "version": "6.0",
-    "rollForward": "latestMinor"
+        "version": "6.0.301",
+        "rollForward": "disable"
   }
 }