chore: update to junit v6

[derklaro]

Motivation

JUnit v6 was released and we should update to it.

Modification

Update to junit v6.

Result

We're using the latest junit version.

[derklaro]

only open to track junit v6 milestones & the pmigration progress.

[github-actions]

Test Results

 56 files  ±0   56 suites  ±0   2m 54s ⏱️ +17s
570 tests ±0  570 ✅ ±0  0 💤 ±0  0 ❌ ±0 
937 runs  ±0  937 ✅ ±0  0 💤 ±0  0 ❌ ±0 

Results for commit 42edcb6. ± Comparison against base commit 5a113ce.

This pull request removes 49 and adds 49 tests. Note that renamed tests count towards both.

eu.cloudnetservice.driver.impl.document.DocumentSerialisationTest ‑ [4] {"b":1,"s":2,"i":3,"l":4,"f":5.0,"d":6.0,"c":"/","string":"Hello, World!","bol":true,"cloud":["Ben?","Yes","No","HoHoHoHo"],"world":{"hello":"world","insane":"!","this":"is"}}, PRETTY
eu.cloudnetservice.driver.impl.document.DocumentTest ‑ [1] json, {}
eu.cloudnetservice.driver.impl.document.DocumentTest ‑ [2] empty, [empty]
eu.cloudnetservice.driver.impl.document.gson.JavaTimeSerializerTest ‑ [23] 11:06:47.249051263
eu.cloudnetservice.driver.impl.document.gson.JavaTimeSerializerTest ‑ [28] 11:06:47.249201674Z
eu.cloudnetservice.driver.impl.document.gson.JavaTimeSerializerTest ‑ [29] 11:06:47.249225048Z
eu.cloudnetservice.driver.impl.document.gson.JavaTimeSerializerTest ‑ [30] 11:06:47.249269270+05:00
eu.cloudnetservice.driver.impl.document.gson.JavaTimeSerializerTest ‑ [31] 11:06:47.249291922-03:00
eu.cloudnetservice.driver.impl.document.gson.JavaTimeSerializerTest ‑ [34] 2025-10-01T11:06:47.252005478
eu.cloudnetservice.driver.impl.document.gson.JavaTimeSerializerTest ‑ [39] 2025-10-01T11:06:47.252167861Z
…

eu.cloudnetservice.driver.impl.document.DocumentSerialisationTest ‑ [4] {"b":1,"s":2,"i":3,"l":4,"f":5.0,"d":6.0,"c":"/","string":"Hello, World!","bol":true,"cloud":["Ben?","Yes","No","HoHoHoHo"],"world":{"hello":"world","this":"is","insane":"!"}}, PRETTY
eu.cloudnetservice.driver.impl.document.DocumentTest ‑ [1] "json", {}
eu.cloudnetservice.driver.impl.document.DocumentTest ‑ [2] "empty", [empty]
eu.cloudnetservice.driver.impl.document.gson.JavaTimeSerializerTest ‑ [23] 12:27:05.514156763
eu.cloudnetservice.driver.impl.document.gson.JavaTimeSerializerTest ‑ [28] 12:27:05.514357267Z
eu.cloudnetservice.driver.impl.document.gson.JavaTimeSerializerTest ‑ [29] 12:27:05.514388876Z
eu.cloudnetservice.driver.impl.document.gson.JavaTimeSerializerTest ‑ [30] 12:27:05.514445041+05:00
eu.cloudnetservice.driver.impl.document.gson.JavaTimeSerializerTest ‑ [31] 12:27:05.514474095-03:00
eu.cloudnetservice.driver.impl.document.gson.JavaTimeSerializerTest ‑ [34] 2025-10-01T12:27:05.514717669
eu.cloudnetservice.driver.impl.document.gson.JavaTimeSerializerTest ‑ [39] 2025-10-01T12:27:05.514865345Z
…

♻️ This comment has been updated with latest results.