Bump actions/upload-artifact from 5 to 6 (#115)

Author: dependabot[bot]

.github/workflows/ci.yml

@@ -37,7 +37,7 @@ jobs:
       working-directory: ./src
       run: dotnet test  --no-build --no-restore --verbosity normal --logger "trx;LogFileName=test-results.trx" Sleddog.Blink1.Tests
 
-    - uses: actions/upload-artifact@v5
+    - uses: actions/upload-artifact@v6
       if: success() || failure()
       with:
         name: test-results

.github/workflows/nuget.yaml

@@ -38,7 +38,7 @@ jobs:
     - name: Pack
       working-directory: ./src
       run: dotnet pack --configuration Release /p:Version=${VERSION} --no-build --output .
-    - uses: actions/upload-artifact@v5
+    - uses: actions/upload-artifact@v6
       if: success() || failure()
       with:
         name: nuget-artifact