Bump org.assertj:assertj-core from 3.25.1 to 3.25.3 in /modules/redpanda

Bumps [org.assertj:assertj-core](https://github.com/assertj/assertj) from 3.25.1 to 3.25.3.
- [Release notes](https://github.com/assertj/assertj/releases)
- [Commits](assertj/assertj@assertj-build-3.25.1...assertj-build-3.25.3)

---
updated-dependencies:
- dependency-name: org.assertj:assertj-core
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

modules/redpanda/build.gradle

@@ -5,6 +5,6 @@ dependencies {
     shaded 'org.freemarker:freemarker:2.3.32'
 
     testImplementation 'org.apache.kafka:kafka-clients:3.7.0'
-    testImplementation 'org.assertj:assertj-core:3.25.1'
+    testImplementation 'org.assertj:assertj-core:3.25.3'
     testImplementation 'io.rest-assured:rest-assured:5.4.0'
 }