Bump actions/upload-artifact from 5 to 6

Bumps [actions/upload-artifact](https://github.com/actions/upload-artifact) from 5 to 6.
- [Release notes](https://github.com/actions/upload-artifact/releases)
- [Commits](actions/upload-artifact@v5...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] <[email protected]>

Author: dependabot[bot]

.github/workflows/ab-testing-ci.yml

@@ -44,7 +44,7 @@ jobs:
       - name: Build
         run: pnpm build
 
-      - uses: actions/upload-artifact@v5
+      - uses: actions/upload-artifact@v6
         with:
           name: ab-testing-build
           path: ab-testing/config/dist
@@ -67,7 +67,7 @@ jobs:
         run: pnpm build
 
       - name: Save build
-        uses: actions/upload-artifact@v5
+        uses: actions/upload-artifact@v6
         with:
           name: ui-build
           path: ab-testing/frontend/output/ab-tests.html
@@ -97,7 +97,7 @@ jobs:
           zip -j lambda.zip ../package.json
 
       - name: Save build
-        uses: actions/upload-artifact@v5
+        uses: actions/upload-artifact@v6
         with:
           name: ab-testing-lambda-build
           path: ab-testing/deploy-lambda/dist/lambda.zip

.github/workflows/bundle-analyser.yml

@@ -19,21 +19,21 @@ jobs:
         working-directory: dotcom-rendering
 
       - name: Archive code coverage results for web bundle
-        uses: actions/upload-artifact@v5
+        uses: actions/upload-artifact@v6
         with:
           name: bundle-analyser-report-web-bundles
           path: dotcom-rendering/dist/stats/client.web-bundles.html
           if-no-files-found: error
 
       - name: Archive code coverage results for web variant bundle
-        uses: actions/upload-artifact@v5
+        uses: actions/upload-artifact@v6
         with:
           name: bundle-analyser-report-web
           path: dotcom-rendering/dist/stats/client.web.variant-bundles.html
           if-no-files-found: warn # Variant bundle only exists when an active experiment is going on
 
       - name: Archive code coverage results for apps bundle
-        uses: actions/upload-artifact@v5
+        uses: actions/upload-artifact@v6
         with:
           name: bundle-analyser-report-apps
           path: dotcom-rendering/dist/stats/client.apps-bundles.html

.github/workflows/playwright.yml

@@ -41,7 +41,7 @@ jobs:
         env:
           NODE_ENV: production
 
-      - uses: actions/upload-artifact@v5
+      - uses: actions/upload-artifact@v6
         if: always()
         with:
           name: playwright-report-${{ matrix.group }}