policy: reduce internal usage of public util for manifest.js

PR-URL: nodejs#26833
Reviewed-By: Yongsheng Zhang <zyszys98@gmail.com>
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: Masashi Hirano <shisama07@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>

lib/internal/policy/manifest.js

@@ -4,7 +4,7 @@ const {
   ERR_MANIFEST_INTEGRITY_MISMATCH,
   ERR_MANIFEST_UNKNOWN_ONERROR,
 } = require('internal/errors').codes;
-const debug = require('util').debuglog('policy');
+const debug = require('internal/util/debuglog').debuglog('policy');
 const SRI = require('internal/policy/sri');
 const {
   SafeWeakMap,