Bump org.assertj:assertj-core from 3.26.0 to 3.26.3

Bumps [org.assertj:assertj-core](https://github.com/assertj/assertj) 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.assertj:assertj-core
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

build.gradle

@@ -57,7 +57,7 @@ dependencies {
   testImplementation 'org.junit.jupiter:junit-jupiter-params'
   testRuntimeOnly 'org.junit.jupiter:junit-jupiter-engine'
   testRuntimeOnly 'org.junit.platform:junit-platform-launcher'
-  testImplementation 'org.assertj:assertj-core:3.26.0'
+  testImplementation 'org.assertj:assertj-core:3.26.3'
   testImplementation 'org.mockito:mockito-core:5.12.0'
   testImplementation "cd.go.plugin:go-plugin-api:$gocdPluginApiVersion"
   testImplementation 'org.skyscreamer:jsonassert:1.5.3'