Bump build and release .NET5 to RC2

Author: kzu

.github/workflows/build.yml

@@ -10,7 +10,7 @@ jobs:
       - uses: actions/checkout@v2
       - uses: actions/setup-dotnet@v1
         with:
-          dotnet-version: 5.0.100-rc.1.20452.10
+          dotnet-version: 5.0.100-rc.2.20479.15
       - uses: actions/setup-dotnet@v1
         with:
           dotnet-version: 2.1.x

.github/workflows/release.yml

@@ -12,6 +12,6 @@ jobs:
       - uses: actions/checkout@v2
       - uses: actions/setup-dotnet@v1
         with:
-          dotnet-version: 5.0.100-rc.1.20452.10
+          dotnet-version: 5.0.100-rc.2.20479.15
       - run: dotnet build -p:version=${GITHUB_REF#refs/*/v}
       - run: dotnet nuget push ./bin/**/*.nupkg -s https://api.nuget.org/v3/index.json -k ${{secrets.NUGET_API_KEY}} --skip-duplicate