update ci with net5.0 version

Author: Legion2

.github/workflows/pages.yml

@@ -13,7 +13,7 @@ jobs:
       - name: Setup .NET Core
         uses: actions/setup-dotnet@v1
         with:
-          dotnet-version: 3.1.302
+          dotnet-version: 5.0.100
       - name: Install dependencies
         run: dotnet restore
       - name: Install tools

.github/workflows/release.yml

@@ -12,7 +12,7 @@ jobs:
       - name: Setup .NET Core
         uses: actions/setup-dotnet@v1
         with:
-          dotnet-version: 3.1.302
+          dotnet-version: 5.0.100
       - name: Install dependencies
         run: dotnet restore
       - name: Publish