Bump org.assertj:assertj-core

Bumps [org.assertj:assertj-core](https://github.com/assertj/assertj) from 3.24.2 to 3.25.1.
- [Release notes](https://github.com/assertj/assertj/releases)
- [Commits](assertj/assertj@assertj-build-3.24.2...assertj-build-3.25.1)

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

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

data-prepper-plugins/otel-metrics-raw-processor/build.gradle

@@ -21,7 +21,7 @@ dependencies {
     implementation 'com.fasterxml.jackson.core:jackson-databind'
     implementation 'com.fasterxml.jackson.dataformat:jackson-dataformat-yaml'
     implementation libs.guava.core
-    testImplementation 'org.assertj:assertj-core:3.24.2'
+    testImplementation 'org.assertj:assertj-core:3.25.1'
     testImplementation testLibs.mockito.inline
 }