chore: update cloud rad kokoro build job (#376)

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Source-Link: googleapis/synthtool@bd0deaa

packages/google-cloud-oslogin/synth.metadata

@@ -4,7 +4,7 @@
       "git": {
         "name": ".",
         "remote": "https://github.com/googleapis/nodejs-os-login.git",
-        "sha": "9145b3e0f477ee4970451ceb3576256f70983e42"
+        "sha": "0b8bb0a2a58c568b62db3f44b7a8b18d8704c38f"
       }
     },
     {
@@ -19,7 +19,7 @@
       "git": {
         "name": "synthtool",
         "remote": "https://github.com/googleapis/synthtool.git",
-        "sha": "94421c47802f56a44c320257b2b4c190dc7d6b68"
+        "sha": "bd0deaa1113b588d70449535ab9cbf0f2bd0e72f"
       }
     }
   ],