chore(deps-dev): bump org.neo4j.test:neo4j-harness in /boot-data-neo4j (#1724)

Bumps [org.neo4j.test:neo4j-harness](https://github.com/neo4j/neo4j) from 5.26.1 to 5.26.4.
- [Release notes](https://github.com/neo4j/neo4j/releases)
- [Commits](neo4j/neo4j@5.26.1...5.26.4)

---
updated-dependencies:
- dependency-name: org.neo4j.test:neo4j-harness
  dependency-version: 5.26.4
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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Author: dependabot[bot]

boot-data-neo4j/pom.xml

@@ -16,7 +16,7 @@
 
     <properties>
         <java.version>21</java.version>
-        <neo4j.version>5.26.1</neo4j.version>
+        <neo4j.version>5.26.4</neo4j.version>
     </properties>
 
     <dependencies>