build(deps): update dependency org.codehaus.mojo:exec-maven-plugin to v3.6.2 (#4180)

This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [org.codehaus.mojo:exec-maven-plugin](https://www.mojohaus.org/exec-maven-plugin) ([source](https://redirect.github.com/mojohaus/exec-maven-plugin)) | `3.6.1` -> `3.6.2` | [![age](https://developer.mend.io/api/mc/badges/age/maven/org.codehaus.mojo:exec-maven-plugin/3.6.2?slim=true)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://developer.mend.io/api/mc/badges/adoption/maven/org.codehaus.mojo:exec-maven-plugin/3.6.2?slim=true)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://developer.mend.io/api/mc/badges/compatibility/maven/org.codehaus.mojo:exec-maven-plugin/3.6.1/3.6.2?slim=true)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://developer.mend.io/api/mc/badges/confidence/maven/org.codehaus.mojo:exec-maven-plugin/3.6.1/3.6.2?slim=true)](https://docs.renovatebot.com/merge-confidence/) |

---

### Release Notes

<details>
<summary>mojohaus/exec-maven-plugin (org.codehaus.mojo:exec-maven-plugin)</summary>

### [`v3.6.2`](https://redirect.github.com/mojohaus/exec-maven-plugin/releases/tag/3.6.2)

[Compare Source](https://redirect.github.com/mojohaus/exec-maven-plugin/compare/3.6.1...3.6.2)

<!-- Optional: add a release summary here -->

#### 🚀 New features and improvements

- Add JPMS ServiceLoader Support with Multi-Release JAR ([#&#8203;500](https://redirect.github.com/mojohaus/exec-maven-plugin/pull/500)) [@&#8203;ascheman](https://redirect.github.com/ascheman)

#### 📦 Dependency updates

- Bump asm.version from 9.8 to 9.9 ([#&#8203;498](https://redirect.github.com/mojohaus/exec-maven-plugin/pull/498)) @&#8203;[dependabot\[bot\]](https://redirect.github.com/apps/dependabot)

</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, check this box

---

This PR was generated by [Mend Renovate](https://mend.io/renovate/). View the [repository job log](https://developer.mend.io/github/googleapis/java-spanner).
<!--renovate-debug:eyJjcmVhdGVkSW5WZXIiOiI0MS4xNDMuMSIsInVwZGF0ZWRJblZlciI6IjQxLjE0My4xIiwidGFyZ2V0QnJhbmNoIjoibWFpbiIsImxhYmVscyI6W119-->

Author: renovate-bot

benchmarks/pom.xml

@@ -126,7 +126,7 @@
       <plugin>
         <groupId>org.codehaus.mojo</groupId>
         <artifactId>exec-maven-plugin</artifactId>
-        <version>3.6.1</version>
+        <version>3.6.2</version>
         <configuration>
           <mainClass>com.google.cloud.spanner.benchmark.LatencyBenchmark</mainClass>
           <cleanupDaemonThreads>false</cleanupDaemonThreads>