[deps]: Update actions/upload-artifact action to v6

Author: renovate[bot]

.github/workflows/a11y-eval-browser.yml

@@ -135,7 +135,7 @@ jobs:
         run: echo "$(<./test-summary/test-summary.md)" >> "$GITHUB_STEP_SUMMARY"
 
       - name: Upload results as artifact
-        uses: actions/upload-artifact@330a01c490aca151604b8cf639adc76d48f6c5d4 # v5.0.0
+        uses: actions/upload-artifact@b7c566a772e6b6bfb58ed0dc250532a479d7789f # v6.0.0
         if: always()
         with:
           name: test-summary

.github/workflows/a11y-eval-web.yml

@@ -113,7 +113,7 @@ jobs:
         run: echo "$(<./test-summary/test-summary.md)" >> "$GITHUB_STEP_SUMMARY"
 
       - name: Upload results as artifact
-        uses: actions/upload-artifact@330a01c490aca151604b8cf639adc76d48f6c5d4 # v5.0.0
+        uses: actions/upload-artifact@b7c566a772e6b6bfb58ed0dc250532a479d7789f # v6.0.0
         if: always()
         with:
           name: test-summary

.github/workflows/test-all-custom-flags.yml

@@ -183,7 +183,7 @@ jobs:
         run: echo "$(<./test-summary/test-summary.md)" >> "$GITHUB_STEP_SUMMARY"
 
       - name: Upload results as artifact
-        uses: actions/upload-artifact@330a01c490aca151604b8cf639adc76d48f6c5d4 # v5.0.0
+        uses: actions/upload-artifact@b7c566a772e6b6bfb58ed0dc250532a479d7789f # v6.0.0
         if: always()
         with:
           name: test-summary

.github/workflows/test-all.yml

@@ -185,7 +185,7 @@ jobs:
         run: echo "$(<./test-summary/test-summary.md)" >> "$GITHUB_STEP_SUMMARY"
 
       - name: Upload results as artifact
-        uses: actions/upload-artifact@330a01c490aca151604b8cf639adc76d48f6c5d4 # v5.0.0
+        uses: actions/upload-artifact@b7c566a772e6b6bfb58ed0dc250532a479d7789f # v6.0.0
         if: always()
         with:
           name: test-summary