deps: update dependency com.google.protobuf:protobuf-bom to v3.21.2 (#722)

[![Mend Renovate](https://app.renovatebot.com/images/banner.svg)](https://renovatebot.com) This PR contains the following updates: | Package | Change | Age | Adoption | Passing | Confidence | |---|---|---|---|---|---| | [com.google.protobuf:protobuf-bom](https://developers.google.com/protocol-buffers/) ([source](https://togithub.com/protocolbuffers/protobuf)) | `3.21.1` -> `3.21.2` | [![age](https://badges.renovateapi.com/packages/maven/com.google.protobuf:protobuf-bom/3.21.2/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/maven/com.google.protobuf:protobuf-bom/3.21.2/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/maven/com.google.protobuf:protobuf-bom/3.21.2/compatibility-slim/3.21.1)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/maven/com.google.protobuf:protobuf-bom/3.21.2/confidence-slim/3.21.1)](https://docs.renovatebot.com/merge-confidence/) | --- ### Release Notes <details> <summary>protocolbuffers/protobuf</summary> ### [`v3.21.2`](https://togithub.com/protocolbuffers/protobuf/compare/v3.21.1...v3.21.2) [Compare Source](https://togithub.com/protocolbuffers/protobuf/compare/v3.21.1...v3.21.2) </details> --- ### Configuration 📅 **Schedule**: Branch creation - At any time (no schedule defined), Automerge - At any time (no schedule defined). 🚦 **Automerge**: Disabled by config. Please merge this manually once you are satisfied. ♻ **Rebasing**: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox. 🔕 **Ignore**: Close this PR and you won't be reminded about this update again. --- - [ ] <!-- rebase-check -->If you want to rebase/retry this PR, click this checkbox. --- This PR has been generated by [Mend Renovate](https://www.mend.io/free-developer-tools/renovate/). View repository job log [here](https://app.renovatebot.com/dashboard#github/googleapis/java-shared-dependencies).

Author: renovate-bot

first-party-dependencies/pom.xml

@@ -59,7 +59,7 @@
  <gax.version>2.18.2</gax.version>
  <grpc-gcp.version>1.1.0</grpc-gcp.version>
  <guava.version>31.1-jre</guava.version>
- <protobuf.version>3.21.1</protobuf.version>
+ <protobuf.version>3.21.2</protobuf.version>
  <google.api-common.version>2.2.1</google.api-common.version>
  <google.common-protos.version>2.9.0</google.common-protos.version>
  <google.core.version>2.8.0</google.core.version>