bug #5333 Fix file missing for php8 (jderusse)

This PR was merged into the 2.16 branch.

Discussion
----------

Fix file missing for php8

##5332 but for 2.16.x

Commits
-------

fb4d4e0 Fix file missing for php8

Author: keradus

box.json.dist

@@ -13,7 +13,8 @@
     "finder": [
         {
             "name": [
-                "*.php"
+                "*.php",
+                "*.php8"
             ],
             "exclude": [
                 "Test",