ci(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/build.yml

@@ -45,7 +45,7 @@ jobs:
         comment_title: "Test Results (Java 21)"
 
     - name: Upload test results
-      uses: actions/upload-artifact@v4
+      uses: actions/upload-artifact@v6
       if: always()
       with:
         name: test-results-java-21
@@ -54,7 +54,7 @@ jobs:
           build/test-results/
           
     - name: Upload static analysis results
-      uses: actions/upload-artifact@v4
+      uses: actions/upload-artifact@v6
       if: always()
       with:
         name: static-analysis-results