Update GitHub Actions workflows. (#701)

This PR was automatically generated by the
update-workflows-ecosystem-providers workflow in the pulumi/ci-mgmt
repo, from commit 6f5f171fa0446a7d4a5ae4e07adc6f8cc5f994c7.

.github/actions/setup-tools/action.yml

@@ -68,7 +68,7 @@ runs:
       if: inputs.tools == 'all' || contains(inputs.tools, 'dotnet')
       uses: actions/setup-dotnet@3951f0dfe7a07e2313ec93c75700083e2005cbab # v4.3.0
       with:
-        dotnet-version: 6.0.x
+        dotnet-version: 8.0.x
 
     - name: Setup Python
       if: inputs.tools == 'all' || contains(inputs.tools, 'python')

devbox.json

@@ -5,7 +5,7 @@
     "[email protected].",
     "nodejs@20.",
     "[email protected]",
-    "dotnet-sdk@6.0.",
+    "dotnet-sdk@8.0.",
     "[email protected]",
     "curl@8"
   ],

examples/realm/csharp/csharp.csproj

@@ -2,7 +2,7 @@
 
   <PropertyGroup>
     <OutputType>Exe</OutputType>
-    <TargetFramework>net6.0</TargetFramework>
+    <TargetFramework>net8.0</TargetFramework>
     <Nullable>enable</Nullable>
   </PropertyGroup>