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/.kokoro/release.sh b/.kokoro/release.sh
index 9e91f24..e10bd89 100755
--- a/.kokoro/release.sh
+++ b/.kokoro/release.sh
@@ -26,7 +26,7 @@
 export PYTHONUNBUFFERED=1
 
 # Move into the package, build the distribution and upload.
-TWINE_PASSWORD=$(cat "${KOKORO_KEYSTORE_DIR}/73713_google_cloud_pypi_password")
+TWINE_PASSWORD=$(cat "${KOKORO_GFILE_DIR}/secret_manager/google-cloud-pypi-token")
 cd github/google-api-python-client
 python3 setup.py sdist bdist_wheel
-twine upload --username gcloudpypi --password "${TWINE_PASSWORD}" dist/*
+twine upload --username __token__ --password "${TWINE_PASSWORD}" dist/*
diff --git a/.kokoro/release/common.cfg b/.kokoro/release/common.cfg
index 3efc6f3..2ea8e55 100644
--- a/.kokoro/release/common.cfg
+++ b/.kokoro/release/common.cfg
@@ -23,18 +23,8 @@
     value: "github/google-api-python-client/.kokoro/release.sh"
 }
 
-# Fetch PyPI password	
-before_action {	
-  fetch_keystore {	
-    keystore_resource {	
-      keystore_config_id: 73713	
-      keyname: "google_cloud_pypi_password"	
-    }	
-  }	
-}
-
 # Tokens needed to report release status back to GitHub
 env_vars: {
   key: "SECRET_MANAGER_KEYS"
-  value: "releasetool-publish-reporter-app,releasetool-publish-reporter-googleapis-installation,releasetool-publish-reporter-pem"
-}
\ No newline at end of file
+  value: "releasetool-publish-reporter-app,releasetool-publish-reporter-googleapis-installation,releasetool-publish-reporter-pem,google-cloud-pypi-token"
+}
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"
       }
     }
   ],