build(deps): update dependency org.codehaus.mojo:exec-maven-plugin to…

… v1.6.0 (#321)

[![WhiteSource Renovate](https://app.renovatebot.com/images/banner.svg)](https://renovatebot.com)

This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [org.codehaus.mojo:exec-maven-plugin](http://www.mojohaus.org/exec-maven-plugin) ([source](https://togithub.com/mojohaus/exec-maven-plugin)) | `1.2.1` -> `1.6.0` | [![age](https://badges.renovateapi.com/packages/maven/org.codehaus.mojo:exec-maven-plugin/1.6.0/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/maven/org.codehaus.mojo:exec-maven-plugin/1.6.0/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/maven/org.codehaus.mojo:exec-maven-plugin/1.6.0/compatibility-slim/1.2.1)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/maven/org.codehaus.mojo:exec-maven-plugin/1.6.0/confidence-slim/1.2.1)](https://docs.renovatebot.com/merge-confidence/) |

---

### Configuration

📅 **Schedule**: 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 [WhiteSource Renovate](https://renovate.whitesourcesoftware.com). View repository job log [here](https://app.renovatebot.com/dashboard#github/googleapis/java-retail).

retail/interactive-tutorials/pom.xml

@@ -59,7 +59,7 @@
       <plugin>
         <groupId>org.codehaus.mojo</groupId>
         <artifactId>exec-maven-plugin</artifactId>
-        <version>1.2.1</version>
+        <version>1.6.0</version>
         <configuration>
           <cleanupDaemonThreads>false</cleanupDaemonThreads>
         </configuration>