build: use PyPI API token in secret manager (#1293)

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Source-Link: https://github.com/googleapis/synthtool/commit/043cc620d6a6111816d9e09f2a97208565fde958
diff --git a/synth.metadata b/synth.metadata
index e428d5e..822bbc9 100644
--- a/synth.metadata
+++ b/synth.metadata
@@ -4,14 +4,14 @@
       "git": {
         "name": ".",
         "remote": "https://github.com/googleapis/google-api-python-client.git",
-        "sha": "bd2c5f9c5c5181e21cf970eb6f966afcf0323723"
+        "sha": "c4ecb6ce55deb57469e380d95d7a3db2e9160fa0"
       }
     },
     {
       "git": {
         "name": "synthtool",
         "remote": "https://github.com/googleapis/synthtool.git",
-        "sha": "0a071b3460344886297a304253bf924aa68ddb7e"
+        "sha": "043cc620d6a6111816d9e09f2a97208565fde958"
       }
     }
   ],