Bump actions/upload-artifact from 6 to 7 (#116)

Bumps [actions/upload-artifact](https://github.com/actions/upload-artifact) from 6 to 7.
- [Release notes](https://github.com/actions/upload-artifact/releases)
- [Commits](actions/upload-artifact@v6...v7)

---
updated-dependencies:
- dependency-name: actions/upload-artifact
  dependency-version: '7'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

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@v6
+    - uses: actions/upload-artifact@v7
       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@v6
+    - uses: actions/upload-artifact@v7
       if: success() || failure()
       with:
         name: nuget-artifact