fix(deps): update dependency net.javacrumbs.json-unit:json-unit-assertj to v5 (#1055)

* fix(deps): update dependency net.javacrumbs.json-unit:json-unit-assertj to v5

* modify renovate config

* restore older jsonunit for java8 compat

---------

Co-authored-by: elastic-renovate-prod[bot] <174716857+elastic-renovate-prod[bot]@users.noreply.github.com>
Co-authored-by: Sylvain Juge <763082+SylvainJuge@users.noreply.github.com>

Author: elastic-renovate-prod[bot]

renovate.json

@@ -29,6 +29,16 @@
         "org.apache.activemq:artemis-jms-server"
       ],
       "enabled": false
+    },
+    {
+      "description": "json-unit-assertj 5+ requires Java 11+, keep major version to preserve java8 compatibility",
+      "matchPackageNames": [
+        "net.javacrumbs.json-unit:json-unit-assertj"
+      ],
+      "matchUpdateTypes": [
+        "major"
+      ],
+      "enabled": false
     }
   ],
   "ignorePaths": [