build(java): switch to release-please for release tagging (googleapis…

…#647)

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.github/release-please.yml

@@ -1,2 +1,3 @@
+bumpMinorPreMajor: true
+handleGHRelease: true
 releaseType: java-yoshi
-bumpMinorPreMajor: true

synth.metadata

@@ -4,7 +4,7 @@
       "git": {
         "name": ".",
         "remote": "https://github.com/googleapis/google-auth-library-java.git",
-        "sha": "d8606083b6632e26463aac0a0d1e92835d2fbcd0"
+        "sha": "3b200797b4418f605f137389889c9719e212a690"
       }
     },
     {