chore(deps-dev): bump approvaltests from 18.3.0 to 18.4.0

Bumps [approvaltests](https://github.com/approvals/ApprovalTests.Java) from 18.3.0 to 18.4.0.
- [Release notes](https://github.com/approvals/ApprovalTests.Java/releases)
- [Commits](approvals/ApprovalTests.Java@18.3.0...18.4.0)

---
updated-dependencies:
- dependency-name: com.approvaltests:approvaltests
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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

pom.xml

@@ -98,7 +98,7 @@
     <junit.version>5.9.1</junit.version>
     <assertj.core.version>3.23.1</assertj.core.version>
     <awaitility.version>4.2.0</awaitility.version>
-    <approvaltests.version>18.3.0</approvaltests.version>
+    <approvaltests.version>18.4.0</approvaltests.version>
     <mockito.version>4.8.0</mockito.version>
 
     <conscrypt-openjdk-uber.bundle.version>1.4.2_1</conscrypt-openjdk-uber.bundle.version>