chore(deps): bump actions/upload-artifact from 4 to 6

Bumps [actions/upload-artifact](https://github.com/actions/upload-artifact) from 4 to 6.
- [Release notes](https://github.com/actions/upload-artifact/releases)
- [Commits](actions/upload-artifact@v4...v6)

---
updated-dependencies:
- dependency-name: actions/upload-artifact
  dependency-version: '6'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

.github/workflows/steps.dotnet-build-test.yml

@@ -1,4 +1,4 @@
-on:
+on:
   workflow_call:
     inputs:
       runs-on:
@@ -117,7 +117,7 @@ jobs:
         dotnet-sonarscanner end /d:sonar.token="${{ secrets.SONAR_TOKEN }}"
 
     - name: 📤 Upload Test And Coverage Results
-      uses: actions/upload-artifact@v4
+      uses: actions/upload-artifact@v6
       if: always() # run this step even if previous step failed
       with:
         name: ${{ inputs.runs-on }}
@@ -136,7 +136,7 @@ jobs:
       shell: pwsh
 
     - name: 📤 Upload Nuget Package
-      uses: actions/upload-artifact@v4
+      uses: actions/upload-artifact@v6
       if: ${{ inputs.publish-package }}
       with:
         if-no-files-found: error