Update dependency org.codehaus.mojo:exec-maven-plugin to v3.1.0

This MR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
org.codehaus.mojo:exec-maven-plugin (source)	3.0.0 -> 3.1.0

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open-api/pom.xml

@@ -86,7 +86,7 @@
             <plugin>
                 <groupId>org.codehaus.mojo</groupId>
                 <artifactId>exec-maven-plugin</artifactId>
-                <version>3.0.0</version>
+                <version>3.1.0</version>
                 <configuration>
                     <mainClass>de.fitko.fitconnect.api.postprocessing.ModelClassPostProcessor</mainClass>
                     <workingDirectory>postprocessing</workingDirectory>