Update to .NET 8

This is only relevant for contributors. Nothing changes for users.

The tests are currently failing however because of
[TINKERPOP-3029](https://issues.apache.org/jira/browse/TINKERPOP-3029).
So, we'll have to wait for Gremlin.Net 3.7.2 here.

Signed-off-by: Florian Hockmann <[email protected]>

.github/workflows/dotnet.yml

@@ -37,7 +37,7 @@ jobs:
       - name: Setup .NET
         uses: actions/setup-dotnet@v4
         with:
-          dotnet-version: 6.0.x
+          dotnet-version: 8.0.x
       - name: Install dependencies
         run: "dotnet restore"
       - name: Build
@@ -66,6 +66,6 @@ jobs:
       - name: Setup .NET
         uses: actions/setup-dotnet@v4
         with:
-          dotnet-version: 6.0.x
+          dotnet-version: 8.0.x
       - name: Push to NuGet Feed
         run: dotnet nuget push './artifacts/*.nupkg' --skip-duplicate --source "$NUGET_FEED" --api-key "$NUGET_KEY"

BUILDING.md

@@ -4,7 +4,7 @@ JanusGraph.Net uses dotnet build for convenient builds across platforms.
 
 ## Requirements
 
-* [.NET 6.0 SDK (version >= 2.1.400)][dotnet-sdk] is needed to build and test the project.
+* [.NET 8.0 SDK][dotnet-sdk] is needed to build and test the project.
 * [Docker][docker] needs to be running in order to execute the integration tests as they automatically start a
 JanusGraph Docker container.
 
@@ -43,6 +43,6 @@ successfully.
 The version number used for the tag should correspond to the version in the
 `.csproj` file as that version is used for the NuGet package.
 
-[dotnet-sdk]: https://dotnet.microsoft.com/en-us/download/dotnet/6.0
+[dotnet-sdk]: https://dotnet.microsoft.com/en-us/download/dotnet
 [docker]: https://www.docker.com/
 [git-tag]: https://git-scm.com/book/en/v2/Git-Basics-Tagging

test/JanusGraph.Net.IntegrationTest/JanusGraph.Net.IntegrationTest.csproj

@@ -1,6 +1,6 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
-    <TargetFramework>net6</TargetFramework>
+    <TargetFramework>net8.0</TargetFramework>
     <IsPackable>false</IsPackable>
   </PropertyGroup>
   <ItemGroup>

test/JanusGraph.Net.UnitTest/JanusGraph.Net.UnitTest.csproj

@@ -1,6 +1,6 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
-    <TargetFramework>net6</TargetFramework>
+    <TargetFramework>net8.0</TargetFramework>
     <IsPackable>false</IsPackable>
   </PropertyGroup>
   <ItemGroup>