build: fix typo in publish (#706)

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Source-Link: googleapis/synthtool@388e10f
Source-Link: googleapis/synthtool@d82decc
Source-Link: googleapis/synthtool@799d8e6

Author: yoshi-automation

handwritten/datastore/.kokoro/publish.sh

@@ -4,7 +4,7 @@
       "git": {
         "name": ".",
         "remote": "https://github.com/googleapis/nodejs-datastore.git",
-        "sha": "c7de8869a111b23386818b08ef7df93a48cf25ab"
+        "sha": "590434816cf2f56bd326c9dafd7e4df2f6a58b3c"
       }
     },
     {
@@ -19,7 +19,7 @@
       "git": {
         "name": "synthtool",
         "remote": "https://github.com/googleapis/synthtool.git",
-        "sha": "303271797a360f8a439203413f13a160f2f5b3b4"
+        "sha": "388e10f5ae302d3e8de1fac99f3a95d1ab8f824a"
       }
     }
   ],