Bump ch.qos.logback:logback-classic from 1.5.20 to 1.5.21 in /e2e-tests

Bumps [ch.qos.logback:logback-classic](https://github.com/qos-ch/logback) from 1.5.20 to 1.5.21.
- [Release notes](https://github.com/qos-ch/logback/releases)
- [Commits](qos-ch/logback@v_1.5.20...v_1.5.21)

---
updated-dependencies:
- dependency-name: ch.qos.logback:logback-classic
  dependency-version: 1.5.21
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

e2e-tests/build.gradle

@@ -23,7 +23,7 @@ dependencies {
     testImplementation 'commons-io:commons-io:2.21.0'
     testImplementation 'org.awaitility:awaitility:4.3.0'
     testImplementation "org.assertj:assertj-core:3.27.6"
-    testImplementation 'ch.qos.logback:logback-classic:1.5.20'
+    testImplementation 'ch.qos.logback:logback-classic:1.5.21'
     testImplementation 'org.xmlunit:xmlunit-assertj3:2.11.0'
     testImplementation 'org.apache.httpcomponents.client5:httpclient5:5.5.1'