chore(java): set yoshi-java as default CODEOWNER (#417)

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Source-Link: googleapis/synthtool@80003a3

.github/CODEOWNERS

@@ -5,6 +5,7 @@
 # https://help.github.com/en/github/creating-cloning-and-archiving-repositories/about-code-owners#codeowners-syntax
 
 # The @googleapis/api-bigtable is the default owner for changes in this repo
+*                       @googleapis/yoshi-java @googleapis/api-bigtable
 **/*.java               @googleapis/api-bigtable
 
 # The java-samples-reviewers team is the default owner for samples changes

synth.metadata

@@ -4,7 +4,7 @@
       "git": {
         "name": ".",
         "remote": "https://github.com/googleapis/java-bigtable.git",
-        "sha": "eb06b61fe20bd3e813ca613e11aec0441caaf60f"
+        "sha": "ad63449259d1858b8c2e63856bf4d5487cbea153"
       }
     },
     {
@@ -19,7 +19,7 @@
       "git": {
         "name": "synthtool",
         "remote": "https://github.com/googleapis/synthtool.git",
-        "sha": "538a68019eb4a36a0cdfa4021f324dd01b784395"
+        "sha": "80003a3de2d8a75f5b47cb2e77e018f7f0f776cc"
       }
     }
   ],