Update to AssertJ 4.0.0-M1 (#790)

See
https://github.com/assertj/assertj/issues/2573\#issuecomment-2709477791

---------

Signed-off-by: Ashley <73482956+ascopes@users.noreply.github.com>

Author: ascopes

pom.xml

@@ -94,7 +94,7 @@
 
   <properties>
     <!-- Dependencies -->
-    <assertj.version>3.27.3</assertj.version>
+    <assertj.version>4.0.0-M1</assertj.version>
     <awaitility.version>4.3.0</awaitility.version>
     <fuzzywuzzy.version>1.4.0</fuzzywuzzy.version>
     <jspecify.version>1.0.0</jspecify.version>