build: adds api-spanner-java team as owners (#246)

Adds @googleapis/api-spanner-java as github codeowners.

Author: thiagotnunes

.github/CODEOWNERS

@@ -4,7 +4,7 @@
 # For syntax help see:
 # https://help.github.com/en/github/creating-cloning-and-archiving-repositories/about-code-owners#codeowners-syntax
 
-*                       @googleapis/yoshi-java
+*                       @googleapis/yoshi-java @googleapis/api-spanner-java
 
 # The java-samples-reviewers team is the default owner for samples changes
 samples/**/*.java       @googleapis/java-samples-reviewers

.repo-metadata.json

@@ -7,5 +7,6 @@
   "language": "java",
   "repo": "googleapis/java-spanner-jdbc",
   "repo_short": "java-spanner-jdbc",
-  "distribution_name": "com.google.cloud:google-cloud-spanner-jdbc"
+  "distribution_name": "com.google.cloud:google-cloud-spanner-jdbc",
+  "codeowner_team": "@googleapis/api-spanner-java"
 }