Remove net6 support

Author: Smaug123

.github/workflows/dotnet.yaml

@@ -20,7 +20,6 @@ jobs:
           - macOS-latest
           - windows-latest
         dotnet:
-          - { sdk: 6.0.x, framework: net6.0 }
           - { sdk: 8.0.x, framework: net8.0 }
 
     runs-on: ${{matrix.os}}
@@ -45,10 +44,10 @@ jobs:
     steps:
       - name: Checkout
         uses: actions/checkout@v4
-      - name: Setup .NET SDK v6.0.x
+      - name: Setup .NET SDK v8.0.x
         uses: actions/setup-dotnet@v4
         with:
-          dotnet-version: 6.0.x
+          dotnet-version: 8.0.x
       - name: Prepare .NET tools
         run: dotnet tool restore
       - name: Run Fantomas
@@ -61,10 +60,10 @@ jobs:
         uses: actions/checkout@v4
         with:
           fetch-depth: 0
-      - name: Setup .NET SDK v6.0.x
+      - name: Setup .NET SDK v8.0.x
         uses: actions/setup-dotnet@v4
         with:
-          dotnet-version: 6.0.x
+          dotnet-version: 8.0.x
       - name: Prepare .NET tools
         run: dotnet tool restore
       - name: Prepare analyzers
@@ -85,10 +84,10 @@ jobs:
         uses: actions/checkout@v4
         with:
           fetch-depth: 0 # so that NerdBank.GitVersioning has access to history
-      - name: Setup .NET SDK v6.0.x
+      - name: Setup .NET SDK v8.0.x
         uses: actions/setup-dotnet@v4
         with:
-          dotnet-version: 6.0.x
+          dotnet-version: 8.0.x
       - name: Build
         run: dotnet build ShapeSifter/ShapeSifter.fsproj --configuration Release
       - name: Pack

ShapeSifter.Test/ShapeSifter.Test.fsproj

@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFrameworks>net6.0;net8.0</TargetFrameworks>
+    <TargetFrameworks>net8.0</TargetFrameworks>
     <WarningLevel>5</WarningLevel>
     <TreatWarningsAsErrors>true</TreatWarningsAsErrors>
     <WarningsAsErrors />