Bump org.codehaus.mojo:exec-maven-plugin from 3.1.0 to 3.2.0 in /java

Bumps [org.codehaus.mojo:exec-maven-plugin](https://github.com/mojohaus/exec-maven-plugin) from 3.1.0 to 3.2.0.
- [Release notes](https://github.com/mojohaus/exec-maven-plugin/releases)
- [Commits](https://github.com/mojohaus/exec-maven-plugin/compare/exec-maven-plugin-3.1.0...3.2.0)

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

Signed-off-by: dependabot[bot] <support@github.com>
diff --git a/java/demo/pom.xml b/java/demo/pom.xml
index c56deb8..e427c65 100644
--- a/java/demo/pom.xml
+++ b/java/demo/pom.xml
@@ -109,7 +109,7 @@
       <plugin>
         <groupId>org.codehaus.mojo</groupId>
         <artifactId>exec-maven-plugin</artifactId>
-        <version>3.1.0</version>
+        <version>3.2.0</version>
         <executions>
           <execution>
             <!-- soy-parser generates template classes in