update github ci & release yml

Author: fabrice

.github/workflows/ci.yml

@@ -19,7 +19,7 @@ jobs:
     - name: Setup .NET Core
       uses: actions/setup-dotnet@v1
       with:
-        dotnet-version: 3.1.404
+        dotnet-version: 6.0.100
     # restore dependencies  
     - name: Install dependencies
       run: dotnet restore

.github/workflows/release.yml

@@ -14,7 +14,7 @@ jobs:
     - name: Setup .NET Core
       uses: actions/setup-dotnet@v1
       with:
-        dotnet-version: 3.1.404
+        dotnet-version: 6.0.100
     - name: Create NuGet Package
       run: dotnet pack -c Release /p:Version=${{ github.event.release.tag_name }} /p:PackageReleaseNotes="See https://github.com/fmichellonet/AzureFunctions.Extensions.OpenIDConnect/releases/tag/${{ github.event.release.tag_name }}"
       working-directory: .\src