chore(java_templates): add default CODEOWNERS files for samples reviews (googleapis#146)

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Source-Link: googleapis/synthtool@8b65daa

Author: yoshi-automation

.github/CODEOWNERS

@@ -0,0 +1,8 @@
+# Code owners file.
+# This file controls who is tagged for review for any given pull request.
+
+# For syntax help see:
+# https://help.github.com/en/github/creating-cloning-and-archiving-repositories/about-code-owners#codeowners-syntax
+
+# The java-samples-reviewers team is the default owner for samples changes
+samples/**/*.java       @googleapis/java-samples-reviewers

synth.metadata

@@ -4,14 +4,14 @@
       "git": {
         "name": ".",
         "remote": "https://github.com/googleapis/java-spanner-jdbc.git",
-        "sha": "839e4dcc0ab9b1044cd0534195a44c37c2e37f14"
+        "sha": "2a7c53e5d503eefc42e7927e58430f8d24fe5b48"
       }
     },
     {
       "git": {
         "name": "synthtool",
         "remote": "https://github.com/googleapis/synthtool.git",
-        "sha": "5b48b0716a36ca069db3038da7e205c87a22ed19"
+        "sha": "8b65daa222d193b689279162781baf0aa1f0ffd2"
       }
     }
   ]