Bump actions/upload-artifact from 6 to 7

---
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>

Author: dependabot[bot]

.github/workflows/build-and-test.yml

@@ -63,7 +63,7 @@ jobs:
 
     - name: Publish Test Results
       if: always()
-      uses: actions/upload-artifact@v6
+      uses: actions/upload-artifact@v7
       with:
         name: test-results
         path: '**/TestResults/*'

.github/workflows/nuget-publish.yml

@@ -103,7 +103,7 @@ jobs:
 
       - name: Upload packages as artifacts
         if: steps.check-pack.outputs.has_packages == 'true'
-        uses: actions/upload-artifact@v6
+        uses: actions/upload-artifact@v7
         with:
           name: nuget-packages
           path: ./nupkgs/*.nupkg