build: --credential-file-override is no longer required (#480)

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Source-Link: googleapis/synthtool@94421c4

packages/google-cloud-compute/synth.metadata

@@ -4,14 +4,14 @@
       "git": {
         "name": ".",
         "remote": "https://github.com/googleapis/nodejs-compute.git",
-        "sha": "f4c9a0c198c4763a41984c391f7bed62f3478541"
+        "sha": "1d3a41a97a3499a648b28fd0f0fdd318fc7473e1"
       }
     },
     {
       "git": {
         "name": "synthtool",
         "remote": "https://github.com/googleapis/synthtool.git",
-        "sha": "5936421202fb53ed4641bcb824017dd393a3dbcc"
+        "sha": "94421c47802f56a44c320257b2b4c190dc7d6b68"
       }
     }
   ]