Bump org.assertj:assertj-core from 3.27.4 to 3.27.6 in /core

Bumps [org.assertj:assertj-core](https://github.com/assertj/assertj) from 3.27.4 to 3.27.6.
- [Release notes](https://github.com/assertj/assertj/releases)
- [Commits](assertj/assertj@assertj-build-3.27.4...assertj-build-3.27.6)

---
updated-dependencies:
- dependency-name: org.assertj:assertj-core
  dependency-version: 3.27.6
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

core/build.gradle

@@ -119,13 +119,13 @@ dependencies {
     // Synthetic JAR used for MountableFileTest and DirectoryTarResourceTest
     testImplementation files('testlib/repo/fakejar/fakejar/0/fakejar-0.jar')
 
-    testImplementation 'org.assertj:assertj-core:3.27.4'
+    testImplementation 'org.assertj:assertj-core:3.27.6'
     testImplementation 'io.rest-assured:rest-assured:5.5.6'
 
     jarFileTestCompileOnly "org.projectlombok:lombok:${lombok.version}"
     jarFileTestAnnotationProcessor "org.projectlombok:lombok:${lombok.version}"
     jarFileTestImplementation 'junit:junit:4.13.2'
-    jarFileTestImplementation 'org.assertj:assertj-core:3.27.4'
+    jarFileTestImplementation 'org.assertj:assertj-core:3.27.6'
     jarFileTestImplementation 'org.ow2.asm:asm-debug-all:5.2'
 }