chore: upgrade .net in build

Author: Christoph Bühler

.github/workflows/dotnet-release.yml

@@ -10,7 +10,7 @@ jobs:
       - name: Setup .NET Core
         uses: actions/setup-dotnet@v1
         with:
-          dotnet-version: 3.1.401
+          dotnet-version: 5.0.100
       - name: Test
         run: ./build.sh --target test --no-logo
   semantic-release:
@@ -23,7 +23,7 @@ jobs:
       - name: Setup .NET Core
         uses: actions/setup-dotnet@v1
         with:
-          dotnet-version: 3.1.401
+          dotnet-version: 5.0.100
       - name: Semantic Release
         uses: cycjimmy/semantic-release-action@v2
         with:

.github/workflows/dotnet-test.yml

@@ -16,6 +16,6 @@ jobs:
       - name: Setup .NET Core
         uses: actions/setup-dotnet@v1
         with:
-          dotnet-version: 3.1.401
+          dotnet-version: 5.0.100
       - name: Test
         run: ./build.sh --target test --no-logo

.github/workflows/github-pages.yml

@@ -12,7 +12,7 @@ jobs:
       - name: Setup .NET Core
         uses: actions/setup-dotnet@v1
         with:
-          dotnet-version: 3.1.401
+          dotnet-version: 5.0.100
       - name: Setup MS Build
         uses: microsoft/[email protected]
       - name: Install DocFX

.github/workflows/security-analysis.yml

@@ -35,7 +35,7 @@ jobs:
       - name: Setup .NET Core
         uses: actions/setup-dotnet@v1
         with:
-          dotnet-version: 3.1.401
+          dotnet-version: 5.0.100
 
       - name: Build
         run: ./build.sh --target compile --no-logo