Bump maven-surefire-plugin in /.github/planetiler-examples-dependabot (#445)

planetiler-examples/standalone.pom.xml

@@ -78,7 +78,7 @@
       <plugin>
         <groupId>org.apache.maven.plugins</groupId>
         <artifactId>maven-surefire-plugin</artifactId>
-        <version>3.0.0-M7</version>
+        <version>3.0.0-M8</version>
       </plugin>
       <plugin>
         <groupId>org.apache.maven.plugins</groupId>