Ignore phpstan error (probably introduced with #928)

phpstan.neon.dist

@@ -23,7 +23,18 @@ parameters:
         - includes/
 
     ignoreErrors:
-        # core/classes/class-setup.php
+        # includes/core/classes/class-setup.php
         #
         # A dev-only errors, which can occur if the gatherpress is symlinked into a WP instance or called via wp-env or Playground.
         - '#^Path in require_once\(\) "\./wp-admin/includes/upgrade\.php" is not a file or it does not exist\.$#'
+
+        # includes/core/classes/endpoints/class-endpoint.php
+        #
+        # A known issue, but not a problem.
+        # This "callable-string" is only used in a debug message and is not run.
+        -
+            # I was not able to get the escaping work for the "'", so this matches all argument.type errors in this file,
+            # which is not nice, but the workaround.
+            # message: '#Parameter #1 \$function_name of function wp_trigger_error expects callable-string, \'GatherPress\\Core\\Endpoints\\Endpoint\' given.#'
+            identifier: argument.type
+            path: includes/core/classes/endpoints/class-endpoint.php