Bump actions/upload-artifact from 5 to 6 (CommunityToolkit#3004)

Author: dependabot[bot]

.github/workflows/benchmarks.yml

@@ -56,7 +56,7 @@ jobs:
                 run: dotnet run --project ${{ env.PathToCommunityToolkitSourceGeneratorsBenchmarksCsproj }} -c Release -- -a "${{ runner.temp }}"
 
             -   name: Publish Benchmarks
-                uses: actions/upload-artifact@v5
+                uses: actions/upload-artifact@v6
                 with:
                     name: Benchmarks
                     path: |

.github/workflows/dotnet-build.yml

@@ -254,7 +254,7 @@ jobs:
                 shell: pwsh
 
             -   name: Upload Package List
-                uses: actions/upload-artifact@v5
+                uses: actions/upload-artifact@v6
                 if: ${{ runner.os == 'Windows' }}
                 with:
                     name: nuget-list
@@ -264,7 +264,7 @@ jobs:
 
             -   name: Publish Packages
                 if: ${{ runner.os == 'Windows' }}
-                uses: actions/upload-artifact@v5
+                uses: actions/upload-artifact@v6
                 with:
                     name: packages
                     path: ${{ github.workspace }}/nuget/
@@ -336,7 +336,7 @@ jobs:
                     --verbosity Information
 
             -   name: Publish Packages
-                uses: actions/upload-artifact@v5
+                uses: actions/upload-artifact@v6
                 with:
                     name: signed-packages
                     if-no-files-found: error