Bump guardrail-maven-plugin from 0.70.0 to 0.71.1 (#187)

Author: dependabot[bot]

pom.xml

@@ -134,7 +134,7 @@
       <plugin>
         <groupId>dev.guardrail</groupId>
         <artifactId>guardrail-maven-plugin</artifactId>
-        <version>0.70.0</version>
+        <version>0.71.1</version>
         <executions>
           <execution>
             <id>generate-petstore-client</id>