chore: Bump org.codehaus.mojo:exec-maven-plugin from 3.1.0 to 3.5.1 (#8075)

Bumps [org.codehaus.mojo:exec-maven-plugin](https://github.com/mojohaus/exec-maven-plugin) from 3.1.0 to 3.5.1.
- [Release notes](https://github.com/mojohaus/exec-maven-plugin/releases)
- [Commits](mojohaus/exec-maven-plugin@exec-maven-plugin-3.1.0...3.5.1)

---
updated-dependencies:
- dependency-name: org.codehaus.mojo:exec-maven-plugin
  dependency-version: 3.5.1
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

vaadin-aura-theme-flow-parent/vaadin-aura-theme-flow/pom.xml

@@ -22,7 +22,7 @@
             <plugin>
                 <groupId>org.codehaus.mojo</groupId>
                 <artifactId>exec-maven-plugin</artifactId>
-                <version>3.1.0</version>
+                <version>3.5.1</version>
                 <executions>
                     <execution>
                         <id>copy-theme-distribution</id>

vaadin-lumo-theme-flow-parent/vaadin-lumo-theme-flow/pom.xml

@@ -30,7 +30,7 @@
             <plugin>
                 <groupId>org.codehaus.mojo</groupId>
                 <artifactId>exec-maven-plugin</artifactId>
-                <version>3.1.0</version>
+                <version>3.5.1</version>
                 <executions>
                     <execution>
                         <id>copy-theme-distribution</id>