Bump spdx-maven-plugin from 0.5.5 to 0.6.0 (#137)

Bumps [spdx-maven-plugin](https://github.com/goneall/spdx-maven-plugin) from 0.5.5 to 0.6.0.
- [Release notes](https://github.com/goneall/spdx-maven-plugin/releases)
- [Commits](spdx/spdx-maven-plugin@v0.5.5...v0.6.0)

---
updated-dependencies:
- dependency-name: org.spdx:spdx-maven-plugin
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

pom.xml

@@ -130,7 +130,7 @@
     <commons.coveralls.version>4.3.0</commons.coveralls.version>
     <commons.coveralls.timestampFormat>EpochMillis</commons.coveralls.timestampFormat>
     <commons.cyclonedx.version>2.7.1</commons.cyclonedx.version>
-    <commons.spdx.version>0.5.5</commons.spdx.version>
+    <commons.spdx.version>0.6.0</commons.spdx.version>
     <commons.failsafe.version>3.0.0-M7</commons.failsafe.version>
     <commons.felix.version>5.1.8</commons.felix.version>
     <commons.jacoco.version>0.8.8</commons.jacoco.version>