chore: update gapic-generator-java version to 2.1.0 (#505)
chore: update gapic-generator-java version to 2.1.0 (#505)

* chore: update gapic-generator-java version to 2.1.0

PiperOrigin-RevId: 391407209

Source-Author: Google APIs <1505422b2465e9a84f6fdfaa161078890c593f06@google.com>
Source-Date: Tue Aug 17 16:48:10 2021 -0700
Source-Repo: googleapis/googleapis
Source-Sha: e1738ee972b49fd0c4d4718b035444495142b781
Source-Link: https://github.com/googleapis/googleapis/commit/e1738ee972b49fd0c4d4718b035444495142b781

* 🦉 Updates from OwlBot

See https://github.com/googleapis/repo-automation-bots/blob/main/packages/owl-bot/README.md

Co-authored-by: Emily Ball <9fe61a4aacf035e9f06745e509f03712e2d9e90e@google.com>
Co-authored-by: Owl Bot <7f39581e9a7ddb69f3fa3e6fc69a582ea2916fc9@users.noreply.github.com>
googleapis/google-cloud-java,googleapis/google-cloud-java,googleapis/google-cloud-java