Update actions/upload-artifact action to v3

Author: renovate-bot

.github/workflows/ci.yml

@@ -226,7 +226,7 @@ jobs:
       - name: Compile phar
         run: tools/box compile
 
-      - uses: actions/upload-artifact@v2
+      - uses: actions/upload-artifact@v3
         with:
           name: commercetools-php-sdk-${{ steps.branch_name.outputs.SOURCE_TAG }}.phar
           path: commercetools-php-sdk.phar