Increase timeout of coverage job in CI

Christoph Schwarzmeierrequested to merge
increase-timeout-coverage into master

This merge request increases the timeout of the coverage job in the nightly CI builds.

The coverage job is build in CMake's Debug mode. Therefore, tests consume significantly more time than in DebugOptimized or Release mode. A timeout of 3000 s was observed to be insufficient for some tests introduced with the free surface LBM extension.

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