chore(python): skip docfx in main presubmit (#1166)

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Source-Link: https://github.com/googleapis/synthtool/commit/fb53b6fb373b7c3edf4e55f3e8036bc6d73fa483
diff --git a/synth.metadata b/synth.metadata
index 9ae955b..1539ae5 100644
--- a/synth.metadata
+++ b/synth.metadata
@@ -4,7 +4,7 @@
       "git": {
         "name": ".",
         "remote": "https://github.com/googleapis/google-api-python-client.git",
-        "sha": "32d1c597b364e2641eca33ccf6df802bb218eea1"
+        "sha": "cc94ec86e652769e9d3d5cb6d6491efb8d76dd21"
       }
     },
     {
@@ -18,7 +18,7 @@
       "git": {
         "name": "synthtool",
         "remote": "https://github.com/googleapis/synthtool.git",
-        "sha": "c2de32114ec484aa708d32012d1fa8d75232daf5"
+        "sha": "fb53b6fb373b7c3edf4e55f3e8036bc6d73fa483"
       }
     }
   ],