chore: release 0.121.3 (#566)

🤖 I have created a release \*beep\* \*boop\*
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### [0.121.3](https://www.github.com/googleapis/java-errorreporting/compare/v0.121.2...v0.121.3) (2021-06-17)


### Bug Fixes

* Update dependencies.sh to not break on mac ([#565](https://www.github.com/googleapis/java-errorreporting/issues/565)) ([5bf8a95](https://www.github.com/googleapis/java-errorreporting/commit/5bf8a958f242eb470ead4f6312d08d57863f753f))
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This PR was generated with [Release Please](https://github.com/googleapis/release-please). See [documentation](https://github.com/googleapis/release-please#release-please).

Author: release-please[bot]

errorreporting/snapshot/pom.xml

@@ -28,7 +28,7 @@
     <dependency>
       <groupId>com.google.cloud</groupId>
       <artifactId>google-cloud-errorreporting</artifactId>
-      <version>0.121.3-beta-SNAPSHOT</version>
+      <version>0.121.3-beta</version>
     </dependency>
     <!-- {x-version-update-end} -->