Bump the test-dependencies group with 1 update (#193)

Bumps the test-dependencies group with 1 update: [nl.jqno.equalsverifier:equalsverifier](https://github.com/jqno/equalsverifier).

- [Release notes](https://github.com/jqno/equalsverifier/releases)
- [Changelog](https://github.com/jqno/equalsverifier/blob/main/CHANGELOG.md)
- [Commits](jqno/equalsverifier@equalsverifier-3.15.3...equalsverifier-3.15.4)

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

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

pom.xml

@@ -54,7 +54,7 @@
     <surefire.version>3.2.2</surefire.version>
 
     <!-- Test dependency versions -->
-    <equalsverifier.version>3.15.3</equalsverifier.version>
+    <equalsverifier.version>3.15.4</equalsverifier.version>
     <junit.version>5.10.1</junit.version>
     <junit.platform.version>1.9.2</junit.platform.version>
     <mockneat.version>0.4.8</mockneat.version>