Bump flatten-maven-plugin from 1.2.5 to 1.2.7 (#6713)

Bumps [flatten-maven-plugin](https://github.com/mojohaus/flatten-maven-plugin) from 1.2.5 to 1.2.7.
- [Release notes](https://github.com/mojohaus/flatten-maven-plugin/releases)
- [Commits](mojohaus/flatten-maven-plugin@flatten-maven-plugin-1.2.5...flatten-maven-plugin-1.2.7)

---
updated-dependencies:
- dependency-name: org.codehaus.mojo:flatten-maven-plugin
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

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

jetty-bom/pom.xml

@@ -17,7 +17,7 @@
       <plugin>
         <groupId>org.codehaus.mojo</groupId>
         <artifactId>flatten-maven-plugin</artifactId>
-        <version>1.2.5</version>
+        <version>1.2.7</version>
         <configuration>
           <outputDirectory>${project.build.directory}</outputDirectory>
           <flattenedPomFilename>flattened-pom.xml</flattenedPomFilename>