Bump org.codehaus.mojo:build-helper-maven-plugin from 3.6.0 to 3.6.1

Bumps [org.codehaus.mojo:build-helper-maven-plugin](https://github.com/mojohaus/build-helper-maven-plugin) from 3.6.0 to 3.6.1.
- [Release notes](https://github.com/mojohaus/build-helper-maven-plugin/releases)
- [Commits](https://github.com/mojohaus/build-helper-maven-plugin/compare/3.6.0...3.6.1)

---
updated-dependencies:
- dependency-name: org.codehaus.mojo:build-helper-maven-plugin
  dependency-version: 3.6.1
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

spec/pom.xml

diff --git a/spec/pom.xml b/spec/pom.xml
index 87f580e..33e6934 100644
--- a/spec/pom.xml
+++ b/spec/pom.xml
@@ -121,7 +121,7 @@
             <plugin>
                 <groupId>org.codehaus.mojo</groupId>
                 <artifactId>build-helper-maven-plugin</artifactId>
-                <version>3.6.0</version>
+                <version>3.6.1</version>
                 <executions>
                     <execution>
                         <id>timestamp-property</id>