fix(version): update org.activiti.build:activiti-parent to 7.1.31

pom.xml

@@ -6,7 +6,7 @@
   <parent>
     <groupId>org.activiti.build</groupId>
     <artifactId>activiti-parent</artifactId>
-    <version>7.1.29</version>
+    <version>7.1.31</version>
     <relativePath/>
   </parent>
   
@@ -20,7 +20,7 @@
   <inceptionYear>2018</inceptionYear>
 
   <properties>
-    <activiti-build.version>7.1.29</activiti-build.version>
+    <activiti-build.version>7.1.31</activiti-build.version>
     <activiti-api.version>7.1.54</activiti-api.version>
     <activiti-core-common.version>7.1.62</activiti-core-common.version> 
     <activiti.version>7.1.121</activiti.version>