Bump exec-maven-plugin from 1.6.0 to 3.1.0 (#370)

Bumps [exec-maven-plugin](https://github.com/mojohaus/exec-maven-plugin) from 1.6.0 to 3.1.0.
- [Release notes](https://github.com/mojohaus/exec-maven-plugin/releases)
- [Commits](mojohaus/exec-maven-plugin@exec-maven-plugin-1.6.0...exec-maven-plugin-3.1.0)

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

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Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Derek Sharpe <36005286+ddsharpe@users.noreply.github.com>

Author: dependabot[bot]

pom.xml

@@ -163,7 +163,7 @@
                 <plugin>
                     <groupId>org.codehaus.mojo</groupId>
                     <artifactId>exec-maven-plugin</artifactId>
-                    <version>1.6.0</version>
+                    <version>3.1.0</version>
                     <executions>
                         <execution>
                             <id>generate-autocompletion-script</id>