Bump maven-failsafe-plugin in /.github/planetiler-examples-dependabot (#158)

planetiler-examples/standalone.pom.xml

@@ -83,7 +83,7 @@
       <plugin>
         <groupId>org.apache.maven.plugins</groupId>
         <artifactId>maven-failsafe-plugin</artifactId>
-        <version>3.0.0-M5</version>
+        <version>3.0.0-M6</version>
       </plugin>
 
       <!-- Create an executable jar from "mvn package" goal -->