Fix and re-enable 8.6 builds

8.6 has significantly changed the XML entity faff D:

Author: shish

.github/workflows/continuous-integration.yml

@@ -105,6 +105,7 @@ jobs:
           - "8.3"
           - "8.4"
           - "8.5"
+          - "8.6"
     steps:
       - name: "Checkout"
         uses: "actions/checkout@v6"

composer.json

@@ -45,6 +45,7 @@
             "generated/json.php",
             "generated/ldap.php",
             "generated/libxml.php",
+            "generated/litespeed.php",
             "generated/lzf.php",
             "generated/mailparse.php",
             "generated/mbstring.php",