Bump org.xmlunit:xmlunit-assertj3 from 2.8.2 to 2.9.1 in /e2e-tests (#679)

Bumps [org.xmlunit:xmlunit-assertj3](https://github.com/xmlunit/xmlunit) from 2.8.2 to 2.9.1.
- [Release notes](https://github.com/xmlunit/xmlunit/releases)
- [Changelog](https://github.com/xmlunit/xmlunit/blob/main/RELEASE_NOTES.md)
- [Commits](xmlunit/xmlunit@v2.8.2...v2.9.1)

---
updated-dependencies:
- dependency-name: org.xmlunit:xmlunit-assertj3
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

e2e-tests/build.gradle

@@ -24,7 +24,7 @@ dependencies {
     testImplementation 'org.junit.jupiter:junit-jupiter-api:5.7.1'
     testImplementation "org.assertj:assertj-core:3.25.3"
     testImplementation 'ch.qos.logback:logback-classic:1.5.3'
-    testImplementation 'org.xmlunit:xmlunit-assertj3:2.8.2'
+    testImplementation 'org.xmlunit:xmlunit-assertj3:2.9.1'
     testImplementation 'org.xmlunit:xmlunit-matchers:2.8.2'
     testImplementation 'org.apache.httpcomponents.client5:httpclient5:5.3.1'