Bump assertj-core from 3.14.0 to 3.15.0

Bumps [assertj-core](https://github.com/joel-costigliola/assertj-core) from 3.14.0 to 3.15.0.
- [Release notes](https://github.com/joel-costigliola/assertj-core/releases)
- [Commits](assertj/assertj@assertj-core-3.14.0...assertj-core-3.15.0)

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

Author: dependabot-preview[bot]

pom.xml

@@ -157,7 +157,7 @@
       <groupId>org.assertj</groupId>
       <artifactId>assertj-core</artifactId>
       <!-- use 2.9.0 for Java 7 projects -->
-      <version>3.14.0</version>
+      <version>3.15.0</version>
       <scope>test</scope>
     </dependency>
     <dependency>