Ignore report format version when comparing test

We have tests frequently failing with following difference:

 {
-  "version": "2.3",
+  "version": "2.1",
   "vulnerabilities": [
     {
       "category": "dependency_scanning",

This MR aims to ignore version part for comparison logic.

Test

https://gitlab.com/gitlab-org/security-products/tests/java-maven/-/jobs/469130214 (is failing due to vuln change not version)