Bump maven-failsafe-plugin in /.github/planetiler-examples-dependabot (#441)

Bumps [maven-failsafe-plugin](https://github.com/apache/maven-surefire) from 3.0.0-M7 to 3.0.0-M8.
- [Release notes](https://github.com/apache/maven-surefire/releases)
- [Commits](https://github.com/apache/maven-surefire/compare/surefire-3.0.0-M7...surefire-3.0.0-M8)

---
updated-dependencies:
- dependency-name: org.apache.maven.plugins:maven-failsafe-plugin
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

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-M7</version>
+        <version>3.0.0-M8</version>
       </plugin>
 
       <!-- Create an executable jar from "mvn package" goal -->