Support for Redmine 4.2

[Art4]

This PR extends the support for Redmine versions that receives security updates. Therefore I've created a new testsuite for Redmine 4.2.10. The newest version is 4.2.11, but this tag is missing on Docker Hub.

Running all behat tests now looks like this.

$ docker compose exec php composer behat
> behat --config tests/Behat/behat.yml --format progress
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196 scenarios (196 passed)
1948 steps (1948 passed)
2m29.44s (17.15Mb)

This PR requires #403 and #402.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.47%. Comparing base (98e72b1) to head (8c29a12).

Additional details and impacted files

@@            Coverage Diff            @@
##               v2.x     #404   +/-   ##
=========================================
  Coverage     98.47%   98.47%           
  Complexity      609      609           
=========================================
  Files            29       29           
  Lines          1841     1841           
=========================================
  Hits           1813     1813           
  Misses           28       28           

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[kbsali]

OMG 👏