Bump the gradle-dependencies group in /functional-tests with 3 updates

Bumps the gradle-dependencies group in /functional-tests with 3 updates: [org.htmlunit:htmlunit](https://github.com/HtmlUnit/htmlunit), [org.jsoup:jsoup](https://github.com/jhy/jsoup) and [org.assertj:assertj-core](https://github.com/assertj/assertj).


Updates `org.htmlunit:htmlunit` from 4.3.0 to 4.4.0
- [Release notes](https://github.com/HtmlUnit/htmlunit/releases)
- [Commits](HtmlUnit/htmlunit@4.3.0...4.4.0)

Updates `org.jsoup:jsoup` from 1.17.2 to 1.18.1
- [Release notes](https://github.com/jhy/jsoup/releases)
- [Changelog](https://github.com/jhy/jsoup/blob/master/CHANGES.md)
- [Commits](jhy/jsoup@jsoup-1.17.2...jsoup-1.18.1)

Updates `org.assertj:assertj-core` from 3.26.0 to 3.26.3
- [Release notes](https://github.com/assertj/assertj/releases)
- [Commits](assertj/assertj@assertj-build-3.26.0...assertj-build-3.26.3)

---
updated-dependencies:
- dependency-name: org.htmlunit:htmlunit
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: gradle-dependencies
- dependency-name: org.jsoup:jsoup
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: gradle-dependencies
- dependency-name: org.assertj:assertj-core
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: gradle-dependencies
...

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

functional-tests/build.gradle

@@ -11,10 +11,10 @@ repositories {
 dependencies {
     testImplementation 'junit:junit:4.13.2'
     testImplementation 'com.thoughtworks.gauge:gauge-java:+'
-    testImplementation 'org.htmlunit:htmlunit:4.3.0'
+    testImplementation 'org.htmlunit:htmlunit:4.4.0'
     testImplementation 'se.fishtank:css-selectors:2.0'
-    testImplementation 'org.jsoup:jsoup:1.17.2'
-    testImplementation 'org.assertj:assertj-core:3.26.0'
+    testImplementation 'org.jsoup:jsoup:1.18.1'
+    testImplementation 'org.assertj:assertj-core:3.26.3'
     testImplementation 'org.json:json:20240303'
 }