Update sdk version.

.github/workflows/build-and-test.yml

@@ -17,7 +17,7 @@ jobs:
     - uses: actions/checkout@v2
     - uses: actions/setup-dotnet@master
       with:
-        dotnet-version: 5.0.100-rc.1.20452.10
+        dotnet-version: 5.0.100-rc.2.20479.15
 
     - name: Build All
       run: .\build-all.ps1

global.json

@@ -1,6 +1,6 @@
 {
   "sdk": {
-    "version": "5.0.100-rc.1.20452.10",
+    "version": "5.0.100-rc.2.20479.15",
     "rollForward": "latestFeature"
   }
 }