[backend] Update dependency net.javacrumbs.json-unit:json-unit-assertj to v5 (release/current)

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
net.javacrumbs.json-unit:json-unit-assertj	4.1.1 -> 5.0.0

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Release Notes

lukas-krecan/JsonUnit (net.javacrumbs.json-unit:json-unit-assertj)

v5.0.0

• Jackson 3 support
• Kotest 6 support
• Spring RestTestClient support with Java and Kotlin DSL
• (Breaking) Removed deprecated fluent assertions API
• Hamcrest dependency made optional
• Migrated to JSpecify (please report if it breaks anything)
• Dependency updates

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Configuration

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 49.01%. Comparing base (f292947) to head (eb88775).

Additional details and impacted files

@@                Coverage Diff                 @@
##             release/current    #4242   +/-   ##
==================================================
  Coverage              49.01%   49.01%           
  Complexity              3502     3502           
==================================================
  Files                    875      875           
  Lines                  26097    26097           
  Branches                1947     1947           
==================================================
  Hits                   12791    12791           
  Misses                 12539    12539           
  Partials                 767      767           

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