Merge branch '9.6' into 10.5

Author: sebastianbergmann

.github/workflows/ci.yml

@@ -26,13 +26,16 @@ jobs:
         uses: shivammathur/setup-php@v2
         with:
           php-version: 8.3
-          extensions: none, iconv, json, phar, tokenizer
+          extensions: none, curl, dom, json, libxml, mbstring, openssl, phar, soap, tokenizer, xml, xmlwriter
           coverage: none
           tools: none
 
-      - name: Run Composer
+      - name: Ensure that composer.json is valid
         run: ./tools/composer validate --strict composer.json
 
+      - name: Ensure that dependencies can be installed
+        run: ./tools/composer install --dry-run
+
   coding-guidelines:
     name: Coding Guidelines