build(deps): bump org.assertj:assertj-core from 3.25.3 to 3.26.0

Bumps [org.assertj:assertj-core](https://github.com/assertj/assertj) from 3.25.3 to 3.26.0.
- [Release notes](https://github.com/assertj/assertj/releases)
- [Commits](assertj/assertj@assertj-build-3.25.3...assertj-build-3.26.0)

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

Signed-off-by: dependabot[bot] <support@github.com>

gradle/libs.versions.toml

@@ -2,7 +2,7 @@
 format.version = "1.1"
 
 [versions]
-assertj = "3.25.3"
+assertj = "3.26.0"
 awaitility = "4.2.0"
 # we need to pin the version of EDC and IH, because these are the last version to contain the DWN implementation plus required
 # EDC classes.