Bump nl.jqno.equalsverifier:equalsverifier from 3.15.4 to 3.15.6

Bumps [nl.jqno.equalsverifier:equalsverifier](https://github.com/jqno/equalsverifier) from 3.15.4 to 3.15.6.
- [Release notes](https://github.com/jqno/equalsverifier/releases)
- [Changelog](https://github.com/jqno/equalsverifier/blob/main/CHANGELOG.md)
- [Commits](jqno/equalsverifier@equalsverifier-3.15.4...equalsverifier-3.15.6)

---
updated-dependencies:
- dependency-name: nl.jqno.equalsverifier:equalsverifier
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>

pom.xml

@@ -79,7 +79,7 @@
         <git-commit-id-plugin.version>7.0.0</git-commit-id-plugin.version>
         <assertj.version>3.24.2</assertj.version>
         <logback.version>1.4.14</logback.version>
-        <equalsverifier.version>3.15.4</equalsverifier.version>
+        <equalsverifier.version>3.15.6</equalsverifier.version>
         <arch.unit.version>1.2.1</arch.unit.version>
         <apache.commons.lang.version>3.14.0</apache.commons.lang.version>
         <fluffyj.version>1.13.2</fluffyj.version>