build(deps): bump org.codehaus.mojo:exec-maven-plugin (#1190)

Bumps [org.codehaus.mojo:exec-maven-plugin](https://github.com/mojohaus/exec-maven-plugin) from 3.1.0 to 3.1.1.
- [Release notes](https://github.com/mojohaus/exec-maven-plugin/releases)
- [Commits](mojohaus/exec-maven-plugin@exec-maven-plugin-3.1.0...3.1.1)

---
updated-dependencies:
- dependency-name: org.codehaus.mojo:exec-maven-plugin
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

benchmarks/latency-comparison/java/pom.xml

@@ -88,7 +88,7 @@
       <plugin>
         <groupId>org.codehaus.mojo</groupId>
         <artifactId>exec-maven-plugin</artifactId>
-        <version>3.1.0</version>
+        <version>3.1.1</version>
         <configuration>
           <mainClass>com.google.cloud.spanner.pgadapter.latency.LatencyBenchmark</mainClass>
           <cleanupDaemonThreads>false</cleanupDaemonThreads>