Use latest 5.1.1 of openapi-generator-maven-plugin

Author: julianladisch

pom.xml

@@ -24,7 +24,7 @@
   <properties>
     <java.version>11</java.version>
     <folio-spring-base.version>1.0.5</folio-spring-base.version>
-    <openapi-generator.version>5.1.0</openapi-generator.version>
+    <openapi-generator.version>5.1.1</openapi-generator.version>
     <mapstruct.version>1.3.1.Final</mapstruct.version>
     <json.version>20200518</json.version>