Test only 8.5 and 8.6 Nightly

Author: shivammathur

.github/nightly_matrix.php

@@ -3,10 +3,10 @@
 const BRANCHES = [
     ['ref' => 'master', 'version' => [8, 6]],
     ['ref' => 'PHP-8.5', 'version' => [8, 5]],
-    ['ref' => 'PHP-8.4', 'version' => [8, 4]],
-    ['ref' => 'PHP-8.3', 'version' => [8, 3]],
-    ['ref' => 'PHP-8.2', 'version' => [8, 2]],
-    ['ref' => 'PHP-8.1', 'version' => [8, 1]],
+    // ['ref' => 'PHP-8.4', 'version' => [8, 4]],
+    // ['ref' => 'PHP-8.3', 'version' => [8, 3]],
+    // ['ref' => 'PHP-8.2', 'version' => [8, 2]],
+    // ['ref' => 'PHP-8.1', 'version' => [8, 1]],
 ];
 
 function get_branch_commit_cache_file_path(): string {