build(deps-dev): bump nl.jqno.equalsverifier:equalsverifier

Bumps [nl.jqno.equalsverifier:equalsverifier](https://github.com/jqno/equalsverifier) from 3.15.5 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-3.15.5...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] <support@github.com>

Author: dependabot[bot]

testcontainers-spring-boot-parent/pom.xml

@@ -19,7 +19,7 @@
         <spring.boot.version>3.2.1</spring.boot.version>
         <spring.cloud.version>2023.0.0</spring.cloud.version>
         <spring.cloud.gcp.version>5.0.0</spring.cloud.gcp.version>
-        <equalsverifier.version>3.15.5</equalsverifier.version>
+        <equalsverifier.version>3.15.6</equalsverifier.version>
         <junit-jupiter.version>5.10.1</junit-jupiter.version>
         <spring.cloud.azure.version>5.8.0</spring.cloud.azure.version>
     </properties>