chore: clean up Node.js TOC for cloud-rad (#433)

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Source-Link: googleapis/synthtool@901ddd4
Source-Link: googleapis/synthtool@f96d3b4

packages/google-cloud-dns/synth.metadata

@@ -4,14 +4,14 @@
       "git": {
         "name": ".",
         "remote": "https://github.com/googleapis/nodejs-dns.git",
-        "sha": "8148fcc6c9da01baae34b08921568f67a2d21616"
+        "sha": "344312d27df9ee70b719afd46b6dd26dac1c5a26"
       }
     },
     {
       "git": {
         "name": "synthtool",
         "remote": "https://github.com/googleapis/synthtool.git",
-        "sha": "5451633881133e5573cc271a18e73b18caca8b1b"
+        "sha": "901ddd44e9ef7887ee681b9183bbdea99437fdcc"
       }
     }
   ],